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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adoption of accounting standards | $ 0 | $ 0 | $ 0 | $ 0 | $ 1,055,049 | $ 1,055,049
Balance at Aug. 31, 2017 | $ 433 | $ 79,185 | 171,431,486 | (11,105) | (103,993,900) | 67,506,099
Balance (in shares) at Aug. 31, 2017 | 432,513 | 23,754,098 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation | $ 0 | $ 0 | 324,840 | 0 | 0 | 324,840
Exercise of options | $ 0 | $ 33 | 74,967 | 0 | 0 | 75,000
Exercise of options (in shares) | 0 | 10,000 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | 0 | 414,680 | 414,680
Unrealized holding gain (loss) on investments | 0 | 0 | 0 | 77,551 | 0 | 77,551
Balance at Aug. 31, 2018 | $ 433 | $ 79,218 | 171,831,293 | 66,446 | (102,524,171) | 69,453,219
Balance (in shares) at Aug. 31, 2018 | 432,513 | 23,764,098 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation | $ 0 | $ 0 | 336,228 | 0 | 0 | 336,228
Exercise of options | $ 0 | $ 209 | 192,892 | 0 | 0 | 193,101
Exercise of options (in shares) | 0 | 62,500 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | 0 | 4,811,148 | 4,811,148
Unrealized holding gain (loss) on investments | 0 | 0 | 0 | (62,556) | 0 | (62,556)
Balance at Aug. 31, 2019 | $ 433 | $ 79,427 | $ 172,360,413 | $ 3,891 | $ (97,713,023) | $ 74,731,141
Balance (in shares) at Aug. 31, 2019 | 432,513 | 23,826,598 |  |  |  |

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