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Note 18 - Other Stockholders' Equity - Reserved Shares (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Shares reserved (in shares) | 10,710,572 | 7,377,160
Shares reserved (in shares) | (10,710,572) | (7,377,160)
Warrants exercised (in shares) | 195,160 | 597,500
Series A Preferred Stock [Member] |  |
Shares reserved (in shares) |  | 5,482,000
Shares reserved (in shares) |  | (5,482,000)
Series B Preferred Stock [Member] |  |
Shares reserved (in shares) |  | 1,700,000
Shares reserved (in shares) |  | (1,700,000)
Series C Preferred Stock [Member] |  |
Shares reserved (in shares) | 1,700,000 |
Shares reserved (in shares) | (1,700,000) |
Series D Preferred Stock [Member] |  |
Shares reserved (in shares) | 1,700,000 |
Shares reserved (in shares) | (1,700,000) |
Series D Preferred Stock Warrants [Member] |  |
Warrants exercised (in shares) | 128,572 |
Series A Preferred Stock Warrants [Member] |  |
Shares reserved (in shares) |  | 195,160
Shares reserved (in shares) |  | (195,160)
Warrants exercised (in shares) |  | 597,500
Warrants 2020 [Member] |  |
Shares reserved (in shares) | 195,160 |
Shares reserved (in shares) | (195,160) |

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