Note 5 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Operating lease right-of-use assets, net	$ 1,216	$ 1,474
Current lease liabilities	873	1,093
Non-current leases	395	465
Lease liabilities	1,268	1,558
Office Leases [Member]
Operating lease right-of-use assets, net	1,216	1,474
Current lease liabilities	873	1,093
Non-current leases	$ 395	$ 465