Note 6 - Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
General and administrative expense	$ 1,445	$ 1,779
General and Administrative Expense [Member]
General and administrative expense	$ 1,445	$ 1,779