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Note 19 - Stock-based Compensation (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2018 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  |  | 500,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 151,000 |  |  |  |
Proceeds (Used for) and Received from Settlement of Stock Awards |  |  | $ 175,000 | $ 233,000 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 106,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expected Shares to be Awarded (in shares) |  |  | 111,000 |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | [1] |  | 151,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 10 years |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 29,000 | 34,000 | 30,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares) |  |  | 440,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Exercise Price (in dollars per share) |  |  | $ 38.11 |  |  |  |
Stock Appreciation Rights (SARs) [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Exercise Price (in dollars per share) |  |  | 19.44 | $ 19.37 | $ 15.24 |  | $ 15.24
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Exercise Price (in dollars per share) |  |  | $ 74.92 | $ 74.92 | $ 50.71 |  | $ 40
Stock Appreciation Rights (SARs) [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 20.00% |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 5 years |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 38,000 | 35,000 | 39,000 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 98,000 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |  |
Sharebased Compensation Arrangement by Share-based Payment Award Post Vesting Holding Period (Year) |  |  | 1 year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Liquidity Discount |  |  | 5.20% | 5.80% | 6.10% |  |
Performance Shares [Member] | Minimum [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 0 |  |  |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 166,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 8,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 12 months |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 5,410 | 8,668 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted |  | $ 350,000 | $ 550,000 |  |  |  |
[1] | Under the 2015 Omnibus Equity Compensation Plan, shares of stock are authorized for issuance as incentive and non-qualified stock options, SARs, RSAs, and RSUs.

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