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Stock-based Payments - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 12, 2013 | Feb. 18, 2011 | Apr. 30, 2020 | Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 600,000 | $ 649,000
Modification expense |  |  | $ 56,529 |
Stock options award shares to purchase common stock | 16,667 |  |  |
Grants in period, weighted average grant date fair value (in dollars per share) |  |  | $ 5.33 | $ 6.03
Shares granted (in shares) |  |  | 229,833 | 206,790
Grants in period, weighted average exercise price (in dollars per share) |  |  | $ 5.33 | $ 9.86
Warrants outstanding (in shares) |  |  | 0 |
Proceeds from warrant exercises |  |  | $ 3,900,000 |
Stock issued during period shares stock options and warrants exercised (in shares) |  |  | 161,000 |
Equity Incentive Plan 2010 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration term of awards |  |  | 10 years |
Strike price as percent of market value |  |  | 100.00% |
Equity Incentive Plan 2010 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares granted, net of forfeitures (in shares) |  | 30,000,000 |  |
2008 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration term of awards |  |  | 10 years |
Director Compensation Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options award shares to purchase common stock | 8,333 |  |  |
Stock option award shares to purchase unregistered common stock | 1,667 |  |  |
Vested percent | 25.00% |  |  |
Board of Directors Chairman | Director Compensation Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of option to purchase |  |  | 5 years |
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 328,000 | $ 458,000
Expense for service performed |  |  | $ 0 | $ 6,000

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