Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits	$ 434,000	$ 438,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	4,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	343,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 14,000	$ 10,000
Open Tax Year	2020