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Note 15 - Common Stock Purchase Agreement - Summary of Shares Purchased by Alumni Capital (Details) - Alumni Capital [Member] - USD ($) |  |  |  |  |  |  | 6 Months Ended
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Sep. 23, 2022 | Aug. 23, 2022 | Aug. 15, 2022 | Aug. 03, 2022 | Jul. 25, 2022 | Mar. 29, 2022 | May 31, 2023 | May 31, 2022
Common stock purchase agreement (in shares) | 65,000 | 65,000 | 50,000 | 50,000 | 50,000 | 20,000 | 280,000 | 20,000
7/25/2022 (in dollars per share) | $ 1.76 | $ 1.99 | $ 2.00 | $ 1.98 | $ 2.07 |  |  |
7/25/2022 | $ 114,120 | $ 129,253 | $ 99,910 | $ 98,940 | $ 103,305 |  | $ 545,528 |

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