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Note 8 - Stock-Based Compensation - Non-vested Restricted Stock Under the Plans (Details) - Non-vested Restricted Stock [Member] - Scenario, Unspecified [Domain] - $ / shares
3 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 823,011 840,841
Issued and unvested at April 30, 2015 (in dollars per share) $ 0.69 $ 0.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 13,000  
Granted (in dollars per share) $ 0.55  
Forfeited (in shares) (13,499)  
Forfeited (in dollars per share) $ 1.02  
Vested (in shares) (17,331)  
Vested (in dollars per share) $ 2.41