Note 4 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total	24.80%	24.80%	25.10%	22.70%
Effective Income Tax Rate Change, Share-based Compensation			$ 455,000
Social Security Tax Payable, Current	$ 656,000		$ 656,000		$ 1,300,000