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Note 8 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Stock Options |  |  | Weighted-Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Outstanding as of December 31, 2022 |  |  | 8,680 |  |  | $ | 12.95 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (6,742 | ) |  |  | 12.59 |  |  |  |  |  |  |  |  |
Forfeited/cancelled/expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding as of June 30, 2023 |  |  | 1,938 |  |  |  | 14.24 |  |  |  | 0.16 |  |  | $ | 5,368 |
Exercisable as of June 30, 2023 |  |  | 1,938 |  |  | $ | 14.24 |  |  |  | 0.16 |  |  | $ | 5,368 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | Nonvested Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested as of December 31, 2022 |  |  | 85,931 |  |  | $ | 26.20 |
Granted |  |  | 93,147 |  |  |  | 16.19 |
Vested |  |  | (46,940 | ) |  |  | 27.59 |
Forfeited/cancelled/expired |  |  | (6,613 | ) |  |  | 23.60 |
Nonvested as of June 30, 2023 |  |  | 125,525 |  |  | $ | 18.39 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
|  | Units (expected) |  |  | Units (maximum) |  |  | Weighted Average Grant Date Fair Value |
Unearned as of December 31, 2022 |  |  | 195,265 |  |  |  |  |  |  | $ | 17.98 |
Awarded |  |  | 85,158 |  |  |  |  |  |  |  | 17.93 |
Vested shares |  |  | (116,192 | ) |  |  |  |  |  |  | 10.77 |
Unearned as of June 30, 2023 |  |  | 164,231 |  |  |  | 233,087 |  |  | $ | 23.06 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Units (expected) |  |  | Weighted Average Grant Date Fair Value |
Unearned as of December 31, 2022 |  |  | 120,035 |  |  | $ | 23.84 |
Awarded |  |  | 146,857 |  |  |  | 18.98 |
Vested shares |  |  | (70,669 | ) |  |  | 19.19 |
Unearned as of June 30, 2023 |  |  | 196,223 |  |  | $ | 21.88 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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