Note 8 - Shareholders' Equity (Details Textual) - USD ($) Pure in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2020	Dec. 31, 2022
Stock Repurchased and Retired During Period, Shares	831,000	951,010
Payments for Repurchase of Common Stock	$ 4,452,000	$ 4,002,000
Share Repurchase Program, Remaining Authorized, Amount	$ 2,742,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross		46,400
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	61,100	292,766		410,615
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 497,000	$ 109,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	231,666	140,916
Proceeds from Stock Options Exercised	$ 832,000
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	29,675	227,000
Share-Based Payment Arrangement, Expense	$ 404,000	$ 145,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	59,000	$ 25,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 88,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 7 months 2 days
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	46,400
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	0	46,400	5,009,750
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period	5 years
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	29,675	227,000
Share-Based Payment Arrangement, Expense	$ 404,000	$ 145,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 639,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 8 months 26 days