Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 4,000	$ 8,000
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%	21.00%	21.00%