Note 5 - Income Taxes (Details Textual) - USD ($) Pure in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax Expense (Benefit)	$ 0	$ 0	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Percent			0.00%	0.00%