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Note 5 - Patents and Trademarks, Net (Tables) | 12 Months Ended
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Aug. 31, 2021
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | August 31, 2021 |  |  | August 31, 2020 |
Patents and trademarks |  | $ | 3,018,507 |  |  | $ | 2,907,852 |
Less accumulated amortization |  |  | (2,308,935 | ) |  |  | (2,105,846 | )
|  | $ | 709,572 |  |  | $ | 802,006 |

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