Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Unrecognized Tax Benefits, Ending Balance	$ 438,000	$ 4,100,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	3,700,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	346,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 10,000	$ 10,000
Open Tax Year	2019