Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating lease right-of-use assets, net	$ 590	$ 429
Current lease liabilities	596	432
Lease liabilities	596	432
Office Leases [Member]
Operating lease right-of-use assets, net	590	429
Current lease liabilities	596	432
Non-current leases	0	0
Land Leases [Member]
Operating lease right-of-use assets, net	0	0
Current lease liabilities	0	0
Non-current leases	$ 0	$ 0