Note 12 - Commitments and Contingencies - Operating Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating lease cost	$ 566	$ 597
Variable lease cost	0	0
Operating lease expense	566	597
Short-term lease rent expense	0	0
Total rent expense	566	597
Operating cash flows from operating leases	$ 456	$ 423
Weighted-average remaining lease term – operating leases (in years) (Year)	2 years 4 months 17 days	2 years 11 months 26 days
Weighted-average discount rate – operating leases	12.00%	12.00%