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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Cash, Cash Equivalents and Restricted Cash [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Cash and cash equivalents |  | $ | 13,434 |  |  | $ | 21,195 |
Restricted cash |  |  | 1,142 |  |  |  | - |
Total cash, cash equivalents and restricted cash |  | $ | 14,576 |  |  | $ | 21,195 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |
Weighted average common shares outstanding–basic |  |  | 10,673,017 |  |  |  | 10,462,246 |
Potentially dilutive securities: |  |  |  |  |  |  |  |
Unvested shares of restricted stock and employee stock options |  |  | 189,521 |  |  |  | 267,616 |
Weighted average common shares and common share equivalents outstanding–diluted |  |  | 10,862,538 |  |  |  | 10,729,862 |
Average number of potentially dilutive securities excluded from calculation |  |  | 478,024 |  |  |  | 231,938 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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