Note 11 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Gross unrecognized tax benefits at the beginning of the year	$ 0	$ 0
Increases related to current year positions	0	0
Increases (decreases) related to prior year positions	691,675	0
Expiration of unrecognized tax benefits	0	0
Gross unrecognized tax benefits at the end of the year	$ 691,675	$ 0