Note 19 - Out-of-Period Adjustment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Expense from Stock Options Exercised			$ 291,000
Retained Earnings (Accumulated Deficit), Ending Balance	$ 62,488,000	$ 58,986,000
Income Tax Expense (Benefit), Total	$ 1,744,000	$ 5,360,000
Earnings Per Share, Basic, Total (in dollars per share)	$ 0.51	$ 2.00
Earnings Per Share, Diluted, Total (in dollars per share)	$ 0.50	$ 1.92
Revision of Prior Period, Error Correction, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance	$ (291,000)	$ (489,000)
Income Tax Expense (Benefit), Total	198,000
Accrued Liabilities, Total		198,000
Deferred Tax Liabilities, Gross, Total		$ 279,000
Earnings Per Share, Basic, Total (in dollars per share)		$ (1)
Earnings Per Share, Diluted, Total (in dollars per share)		$ (2)
Revision of Prior Period, Error Correction, Adjustment [Member] | Error Correction for Taxes Corrected in Retained Earnings [Member]
Current State and Local Tax Expense (Benefit)	12,000
Revision of Prior Period, Error Correction, Adjustment [Member] | Error Correction for Taxes Corrected in Provision for Income Tax [Member]
Deferred Tax Expense from Stock Options Exercised	44,000
Current State and Local Tax Expense (Benefit)	$ 154,000