Note 6 - Select Balance Sheet and Statement of Operations Information - Finance Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Interest expense	$ 858	$ 1,138
Accretion on long-term debt and amortization of fees	65	747
Total finance expenses	$ 923	$ 1,885