Note 10 - Leases - Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating cash outflows from operating leases	$ 53	$ 50	$ 111	$ 97
Weighted average remaining lease term in years (Year)	1 year 8 months 26 days	2 years 8 months 8 days	1 year 8 months 26 days	2 years 8 months 8 days
Weighted average discount rate	6.00%	6.00%	6.00%	6.00%