Note 11 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 |
Share-Based Payment Arrangement, Expense | $ 959 | $ 964 | |
Annual Board Service [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | | | 250,000 |
Board Committee Service [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | | | 1 year |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | | | 78,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | | | 10 years |
Share Price (in dollars per share) | | | $ 12.11 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) | | | $ 3.88 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) (Year) | | | 5 years 3 months |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | 28% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | 4.16% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | 82,000 | | |
Continued Service of the Chairman of the Board [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | | | 400,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | | | 10 years |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) | | | $ 9.08 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) (Year) | | | 6 years 1 month 13 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | 37% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | 3.53% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) | | | $ 3.94 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares) | 400,000 | | |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 1,100 | | |
Continued Service of the Chairman of the Board [Member] | Share-Based Payment Arrangement, Tranche One [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | | | 133,334 |
Continued Service of the Chairman of the Board [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | | | 133,333 |
Continued Service of the Chairman of the Board [Member] | Share-Based Payment Arrangement, Tranche Three [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | | | 133,333 |
Chief Executive Officer [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | 400,000 | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) | $ 15.75 | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) (Year) | 6 years | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 31% | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 3.82% | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) | $ 6.02 | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares) | 400,000 | | |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 2,200 | | |
Chief Executive Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | 133,334 | | |
Chief Executive Officer [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | 133,333 | | |
Chief Executive Officer [Member] | Share-Based Payment Arrangement, Tranche Three [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | 133,333 | | |
Restricted Stock [Member] | | | |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years | | |
Share-Based Payment Arrangement, Expense | $ 200 | 800 | |
Share-Based Payment Arrangement, Option [Member] | | | |
Share-Based Payment Arrangement, Expense | | $ 600 | |