Note 3 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effective Income Tax Rate Reconciliation, Percent	21.50%	23.50%	22.40%	24.50%
Income Tax Reconciliation, State Tax Changes	$ 313,000		$ 572,000
Effective Income Tax Rate Change, Share-based Compensation	$ 138,000		$ 110,000