Note 10 - Leases - Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating cash outflows from operating leases	$ 51	$ 50	$ 148	$ 184
Weighted average remaining lease term in years (Year)	2 years 5 months 12 days	3 years 5 months 4 days	2 years 5 months 12 days	3 years 5 months 4 days
Weighted average discount rate	6.00%	6.00%	6.00%	6.00%