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Note 9 - Share-based Compensation and Employee Benefit Plan (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Three months ended March 31, 2021: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2020 |  |  | 18,498 |  |  | $ | 7.29 |
Vested |  |  | (700 | ) |  | $ | 17.85 |
Unvested at March 31, 2021 |  |  | 17,798 |  |  | $ | 6.88 |
Three months ended March 31, 2020: |  |  |  |  |  |  |  |
Unvested at December 31, 2019 |  |  | 21,470 |  |  | $ | 12.91 |
Vested |  |  | (2,172 | ) |  | $ | 14.56 |
Unvested at March 31, 2020 |  |  | 19,298 |  |  | $ | 12.73 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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