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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
Weighted average common shares outstanding–basic |  |  | 10,256,560 |  |  |  | 10,373,164 |
Potentially dilutive securities: |  |  |  |  |  |  |  |
Unvested shares of restricted stock and employee stock options |  |  | - |  |  |  | 18,811 |
Weighted average common shares and common share equivalents outstanding–diluted |  |  | 10,256,560 |  |  |  | 10,391,975 |
Average number of potentially dilutive securities excluded from calculation |  |  | 717,015 |  |  |  | 523,485 |

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