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)

v3.5.0.2
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, 2016
Apr. 30, 2015
Deferred tax assets:    
Compensated absences and severance, principally due to accruals for financial reporting purposes $ 3,000 $ 3,000
Stock-based compensation expense 1,438,000 1,151,000
Accounts receivable, principally due to allowance for doubtful accounts and sales returns 36,000 49,000
Property and equipment, principally due to differences in depreciation 208,000 216,000
Intangible assets 3,000 53,000
Inventories 104,000 54,000
Net operating losses 10,691,000 10,609,000
Alternative minimum tax 438,000 438,000
Capitalized R & D cost 116,000 128,000
Other 13,000 23,000
Net deferred tax assets 13,050,000 12,724,000
Valuation allowance (13,050,000) (12,724,000)
Net deferred tax assets $ 0 $ 0