Note 12 - Commitments and Contingencies - Operating Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating cash flows from operating leases	$ 112	$ 143
Operating lease cost	$ 113	$ 139
Weighted-average remaining lease term – operating leases (in years) (Year)	1 year 9 months 21 days	2 years 4 months 17 days
Variable lease cost	$ 0	$ 0
Weighted-average discount rate – operating leases	12.00%	12.00%
Operating lease expense	$ 113	$ 139
Short-term lease rent expense	5	0
Total rent expense	$ 118	$ 139