Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Operating lease right-of-use assets, net	$ 951	$ 1,474
Current lease liabilities	634	1,093
Non-current leases	331	465
Lease liabilities	965	1,558
Office Leases [Member]
Operating lease right-of-use assets, net	951	1,474
Current lease liabilities	634	1,093
Non-current leases	$ 331	$ 465