Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent, Total	(0.40%)	0.20%
Income Tax Expense (Benefit), Total	$ 84	$ (38)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0
Forecast [Member]
Effective Income Tax Rate Reconciliation, Percent, Total			0.30%