Annual report pursuant to Section 13 and 15(d)

Income Taxes - The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities (Details)

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Income Taxes - The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities (Details) - USD ($)
Apr. 30, 2015
Apr. 30, 2014
Deferred tax assets:    
Compensated absences and severance, principally due to accruals for financial reporting purposes $ 3,000 $ 75,000
Stock-based compensation expense 1,151,000 1,275,000
Accounts receivable, principally due to allowance for doubtful accounts and sales returns 49,000 86,000
Property and equipment, principally due to differences in depreciation 216,000 240,000
Intangible assets 53,000 430,000
Inventories 54,000 68,000
Domestic net operating losses 10,609,000 10,134,000
Alternative minimum tax 438,000 438,000
Capitalized R & D cost 128,000 0
Other 23,000 153,000
Deferred tax assets 12,724,000 12,899,000
Valuation allowance $ (12,724,000) $ (12,899,000)
Net deferred tax assets