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Note 7 - Stock Plans (Details Textual) - $ / shares $ / shares in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2015 | Dec. 31, 2023
Common Stock, No Par Value (in dollars per share) | $ 0 |  |  | $ 0
Stock Settled Stock Appreciation Rights SSARs [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised (in shares) | (0) | 0 |  |
The 2022 Stock Incentive Plan [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 500,000 |  |  |
The 2022 Stock Incentive Plan [Member] | Restricted Stock [Member] | Vesting Each Year [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 33.00% |  |  |
The 2022 Stock Incentive Plan [Member] | Restricted Stock [Member] | Award Date Three [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 1 year |  |  |
The 2022 Stock Incentive Plan [Member] | Restricted Stock [Member] | Award Date Two [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years |  |  |
Long-Term Incentive Plan [Member] | Stock Settled Stock Appreciation Rights SSARs [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 10 years |
Long-Term Incentive Plan [Member] | Restricted Stock [Member] | New Employee [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 12,429 | 17,684 |  |
The 2002 Employee Stock Purchase Plan [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 165,000 |  |  |
Shares, Issued (in shares) | 108,591 |  |  |

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