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Note 7 - Stock Plans (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] |
|  | June 30, 2023 |  |  | June 30, 2022 |
|  |  |  |  |  |  | Weighted- |  |  |  |  |  |  |  | Weighted- |
|  | Shares |  |  |  | average grant |  |  | Shares |  |  |  | average grant |
|  | granted |  |  |  | date fair value |  |  | granted |  |  |  | date fair value |
Director plan |  |  | - |  |  |  | $ | - |  |  |  | 18,000 |  | (2) |  | $ | 49.85 |
Omnibus plan |  |  | 18,000 |  | (2) |  |  | 49.43 |  |  |  | 16,520 |  | (3) |  |  | 49.85 |
Omnibus plan |  |  | 17,684 |  | (3) |  |  | 49.43 |  |  |  | 50 |  | (1) |  |  | 35.91 |
Omnibus plan |  |  | 50 |  | (1) |  |  | 49.43 |  |  |  | - |  |  |  |  | - |
Omnibus plan |  |  | 1,000 |  | (3) |  |  | 44.06 |  |  |  | - |  |  |  |  | - |
Total |  |  | 36,734 |  |  |  | $ | 49.28 |  |  |  | 34,570 |  |  |  | $ | 49.83 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | 2012 & 2022 Stock incentive plans |
|  | Director |  |  | Omnibus |  |  | Total |  |  | Weighted- average grant date fair value |
Non-vested balance at December 31, 2022 |  |  | 23,872 |  |  |  | 38,614 |  |  |  | 62,486 |  |  | $ | 51.46 |
Granted |  |  | - |  |  |  | 36,734 |  |  |  | 36,734 |  |  |  | 49.28 |
Forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Vested |  |  | (11,353 | ) |  |  | (12,930 | ) |  |  | (24,283 | ) |  |  | 52.57 |
Non-vested balance at June 30, 2023 |  |  | 12,519 |  |  |  | 62,418 |  |  |  | 74,937 |  |  | $ | 50.04 |
Share-Based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] |
|  | Awards |  |  | Weighted-average grant date fair value |  |  | Weighted-average remaining contractual term (years) |
Outstanding December 31, 2022 |  |  | 87,133 |  |  | $ | 9.69 |  |  |  | 4.5 |
Granted |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (7,665 | ) |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  |  |  |  |  |  |
Outstanding June 30, 2023 |  |  | 79,468 |  |  | $ | 10.18 |  |  |  | 4.1 |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
(dollars in thousands) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Stock-based compensation expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 Director stock incentive plan |  | $ | 173 |  |  | $ | 263 |  |  | $ | 287 |  |  | $ | 372 |
2012 Omnibus stock incentive plan |  |  | 118 |  |  |  | 150 |  |  |  | 259 |  |  |  | 315 |
2022 Omnibus stock incentive plan |  |  | 227 |  |  |  | - |  |  |  | 383 |  |  |  | - |
Employee stock purchase plan |  |  | - |  |  |  | - |  |  |  | 34 |  |  |  | 32 |
Total stock-based compensation expense |  | $ | 518 |  |  | $ | 413 |  |  | $ | 963 |  |  | $ | 719 |
Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block] |
|  | As of |
(dollars in thousands) |  | June 30, 2023 |
Unrecognized stock-based compensation expense: |  |  |  |
2012 Director stock incentive plan |  | $ | 486 |
2012 Omnibus stock incentive plan |  |  | 552 |
2022 Omnibus stock incentive plan |  |  | 1,428 |
Total unrecognized stock-based compensation expense |  | $ | 2,466 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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