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Note 7 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | Time-Based RSUs |  |  | Performance-Based RSUs |
|  |  |  |  |  | Weighted-Average |  |  |  |  |  |  | Weighted-Average |
|  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Balance at December 31, 2022 |  |  | 202,059 |  |  | $ | 33.29 |  |  |  | 362,965 |  |  | $ | 31.56 |
Granted |  |  | 813 |  |  |  | 36.87 |  |  |  | — |  |  |  | — |
Vested |  |  | (1,660 | ) |  |  | 33.68 |  |  |  | (136,808 | ) |  |  | 34.21 |
Forfeited |  |  | (1,395 | ) |  |  | 42.12 |  |  |  | — |  |  |  | — |
Balance at June 30, 2023 |  |  | 199,817 |  |  | $ | 33.24 |  |  |  | 226,157 |  |  | $ | 29.96 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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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