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Description of Business and Significant Accounting Policies - Stock Option Expense (Details Narrative) (USD $)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
1 Months Ended |
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Jun. 30, 2008
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Jan. 31, 2015
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Jan. 31, 2014
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Jan. 31, 2015
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Jan. 31, 2014
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Sep. 23, 2010
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Sep. 22, 2011
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Jul. 19, 2012
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Apr. 30, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of options outstanding |
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248,244us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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248,244us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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264,244us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Number of shares granted |
8,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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| Options expiration period |
Ten years after date of grant.
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| Compensation expense |
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$ 5,000us-gaap_ShareBasedCompensation
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$ 5,000us-gaap_ShareBasedCompensation
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$ 14,148us-gaap_ShareBasedCompensation
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$ 43,399us-gaap_ShareBasedCompensation
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| Options granted, exercise price |
$ 15.60DRAM_OptionsGrantedExercisePrice
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| Percentage of options exercisable on date of grant |
100.00%DRAM_PercentageOfOptionsExercisableOnDateOfGrant
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| Stock options | 2001 Incentive and Non-statutory Stock Option Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares allowed for granting under the plan |
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300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandOneIncentiveAndNonStatutoryStockOptionPlanMember
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300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandOneIncentiveAndNonStatutoryStockOptionPlanMember
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| Stock options | 2001 Incentive and Non-statutory Stock Option Plan | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Stock options | 2001 Incentive and Non-statutory Stock Option Plan | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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5 years
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| Stock options | 2011 Incentive and Non-statutory Stock Option Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares allowed for granting under the plan |
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33,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandElevenIncentiveAndNonStatutoryStockOptionPlanMember
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33,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandElevenIncentiveAndNonStatutoryStockOptionPlanMember
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| Number of shares granted |
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25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandElevenIncentiveAndNonStatutoryStockOptionPlanMember
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| Stock options | 2011 Incentive and Non-statutory Stock Option Plan | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Stock options | 2011 Incentive and Non-statutory Stock Option Plan | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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5 years
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| Stock options | 2014 Equity Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares allowed for granting under the plan |
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250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandFourteenEquityIncentivePlanMember
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250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= DRAM_TwoThousandFourteenEquityIncentivePlanMember
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| Stock options | 2014 Equity Incentive Plan | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Stock options | 2014 Equity Incentive Plan | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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5 years
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| Nonqualified Stock Options | Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options expiration period |
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Expire either five or ten years after date of grant.
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| Nonqualified Stock Options | Minimum | Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Nonqualified Stock Options | Maximum | Director |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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2 years
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| Nonqualified Stock Options 2010-09-23 | David Sheerr |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Number of shares granted |
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16,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= DRAM_NonqualifiedStockOptions20100923Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
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| Options expiration period |
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Expire five years after date of grant.
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| Nonqualified Stock Options 2011-09-22 | David Sheerr |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Number of shares granted |
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16,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= DRAM_NonqualifiedStockOptions20110922Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
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| Options expiration period |
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Expire five years after date of grant.
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| Nonqualified Stock Options 2012-07-19 | David Sheerr |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting periods for options |
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1 year
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| Number of shares granted |
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16,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= DRAM_NonqualifiedStockOptions20120719Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
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| Options expiration period |
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Expire five years after date of grant.
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