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Note 9 - Stock-based Compensation Plan (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at January 1, 2023 |  |  | 12,550 |  |  | $ | 57.07 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | 850 |  |  |  | 56.76 |
Nonvested at June 30, 2023 |  |  | 11,700 |  |  | $ | 57.09 |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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