Note 10 - Leases - Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating cash outflows from operating leases	$ 50	$ 47	$ 97	$ 134
Weighted average remaining lease term in years (Year)	2 years 8 months 8 days	3 years 8 months 1 day	2 years 8 months 8 days	3 years 8 months 1 day
Weighted average discount rate	6.00%	6.00%	6.00%	6.00%