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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2018 | $ 3 | $ 11 | $ (1,252) | $ 72,070 | $ (70,826)
Balance (in shares) at Apr. 30, 2018 |  | 11,003,228 | 269,685 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 636 |  |  | 636 |
Issuance of common stock for services | 6 |  |  | 6 |
Issuance of common stock (in shares) |  | 5,462 |  |  |
Issuance of common stock on exercise of stock options and warrants | 1,465 | $ 1 | $ 1,252 | 212 |
Issuance of common stock on exercise of stock options and warrants (in shares) |  | 610,848 | (269,685) |  |
Net income (loss) | 128 |  |  |  | 128
Balance at Apr. 30, 2019 | 2,238 | $ 12 | $ 0 | 72,924 | (70,698)
Balance (in shares) at Apr. 30, 2019 |  | 11,619,538 | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation | 600 |  |  | 600 |
Issuance of common stock on exercise of stock options and warrants | 4,455 | $ 1 |  | 4,454 |
Issuance of common stock on exercise of stock options and warrants (in shares) |  | 1,107,190 |  |  |
Net income (loss) | (1,975) |  |  |  | (1,975)
Balance at Apr. 30, 2020 | $ 5,318 | $ 13 | $ 0 | $ 77,978 | $ (72,673)
Balance (in shares) at Apr. 30, 2020 |  | 12,726,728 | 0 |  |

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