Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent, Total	21.10%	21.60%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Tax Credit Carryforward, Amount	$ 0		$ 0
Operating Loss Carryforwards, Total	$ 0		$ 0