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Note 3 - Shareholders' Equity (Details Textual) - USD ($) Pure in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2020	Dec. 31, 2004
Stock Repurchased and Retired During Period, Shares	270,000	200,000
Payments for Repurchase of Common Stock	$ 1,417,000	$ 833,000
Share Repurchase Program, Remaining Authorized, Amount	$ 777,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	10,715
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 15,000	$ 3,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 132,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 3 months
The2004 Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant				5,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross			5,009,750
Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance	1,800,000
Incentive Plan 2020 [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	10,715	0
Share-Based Payment Arrangement, Expense	$ 94,000	$ 18,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 840,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 4 months 20 days