Note 8 - Shareholders' Equity (Details Textual) - USD ($) Pure in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stock Repurchased and Retired During Period, Shares	910,700	439,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,195,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 37,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	4 years 8 months 23 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance	410,615	427,580	568,740
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	$ 12,000	$ 806,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	21,665	134,494
Proceeds from Stock Options Exercised	$ 80,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 104,000	$ 131,000
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 (in shares)	19,600	0	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	50 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	21,772	15,140
Share-Based Payment Arrangement, Expense	$ 104,000	$ 131,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 63,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	10 months 13 days

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