Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating lease expense	$ 221	$ 164	$ 378	$ 314
Short-term lease expense	69	70	131	124
Total lease expense	290	234	509	438
Cash flows from operating activities			288	452
In exchange for new operating lease liabilities during the period			1,332	712
Office Leases [Member]
Operating lease expense	$ 221	$ 164	$ 378	$ 314