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Note 16 - Private Offerings of Common Stock (Details Textual) - Private Placement [Member] - USD ($) |  |  | 1 Months Ended
--- | --- | --- | ---
Dec. 10, 2021 | Aug. 26, 2021 | Aug. 31, 2022 | Mar. 31, 2021
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 1,572,506 | 330,666
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 1.2 | $ 1.5
Proceeds from Issuance of Private Placement | $ 10,000,000 | $ 2,800,000 | $ 1,887,000 | $ 495,999
Sale of Stock, Number of Units Issued (in shares) | 3,289,526 | 1,400,000 |  |
Sale of Stock, Price per Unit (in dollars per share) | $ 3.04 | $ 2 |  |
Sale of Stock, Number of Common Stock in Each Unit (in shares) |  | 1 |  |
Sale of Stock, Number of Warrants in Each Unit (in shares) |  | 1 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 4.5 | $ 3 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 657,933 | 1,400,000 |  |
Class of Warrant or Right, Minimum Weighted Average Price Per Share Required for Mandatory Exercise of Warrants (in dollars per share) | $ 12.5 |  |  |

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