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Note 14 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted- average Exercise Price Per Share |
Outstanding, January 1, 2020 |  |  | 14,500 |  |  | $ | 8.78 |
Exercised |  |  | (2,350 | ) |  |  | 8.78 |
Outstanding, December 31, 2020 |  |  | 12,150 |  |  | $ | 8.78 |
Exercisable, December 31, 2020 |  |  | 12,150 |  |  | $ | 8.78 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | Units |  |  | Weighted- average Grant Date Fair Value Per Unit |
Nonvested at January 1, 2020 |  |  | 56,066 |  |  | $ | 21.67 |
Granted |  |  | 22,574 |  |  |  | 26.09 |
Vested |  |  | (11,006 | ) |  |  | 19.35 |
Nonvested at December 31, 2020 |  |  | 67,634 |  |  | $ | 23.51 |
Expected to vest at December 31, 2020 |  |  | 18,622 |  |  | $ | 24.02 |

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