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Note 13 - Employee Stock Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | May 31, 2010
Share-Based Payment Arrangement, Expense | $ 3,279 | $ 3,153 | $ 4,236 | $ 5,053 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 39.50 |  |
The 2010 Stock Incentive Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  | 2,130,000
The 2010 Stock Incentive Plan [Member] | Equity Awards [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | 2,229 | 2,801 | $ 3,249 | 3,724 |
The 2010 Stock Incentive Plan [Member] | Performance Shares [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | 1,961 | 2,052 | $ 1,544 | 2,711 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 37.36 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 3,194 |  | $ 3,194 |  |
The 2010 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | 1,318 | $ 1,101 | 2,692 | $ 2,342 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 2,594 |  | $ 2,594 |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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