Note 12 - Commitments and Contingencies - Operating Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating lease cost	$ 116	$ 139	$ 255	$ 149
Variable lease cost	0	0	0	0
Operating lease expense	116	139	255	149
Short-term lease rent expense	3	0	3	0
Total rent expense	$ 119	$ 139	258	149
Operating cash flows from operating leases			$ 261	$ 221
Weighted-average remaining lease term – operating leases (in years) (Year)	2 years 3 months	2 years 7 months 24 days	2 years 3 months	2 years 7 months 24 days
Weighted-average discount rate – operating leases	12.00%	12.00%	12.00%	12.00%