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Note 2 - Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Cash, Cash Equivalents and Restricted Cash [Table Text Block] |
|  | June 30, 2023 |  |  | December 31, 2022 |
Cash and cash equivalents |  | $ | 37,435 |  |  | $ | 13,434 |
Restricted cash |  |  | - |  |  |  | 1,142 |
Total cash, cash equivalents and restricted cash |  | $ | 37,435 |  |  | $ | 14,576 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Weighted average common shares outstanding - basic |  |  | 11,241,183 |  |  |  | 10,653,268 |  |  |  | 10,998,456 |  |  |  | 10,635,270 |
Potentially dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares of restricted stock and employee stock options |  |  | 455,386 |  |  |  | 161,531 |  |  |  | 394,161 |  |  |  | 193,426 |
Weighted average common shares and common share equivalents outstanding - diluted |  |  | 11,696,569 |  |  |  | 10,814,799 |  |  |  | 11,392,617 |  |  |  | 10,828,696 |
Average number of potentially dilutive securities excluded from calculation because their effect was anti-dilutive during the period |  |  | 96,661 |  |  |  | 608,322 |  |  |  | 125,545 |  |  |  | 477,448 |

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