Note 10 - Leases - Operating Leases Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Noncurrent operating lease liabilities	$ 409	$ 291
Other Noncurrent Assets [Member]
Other noncurrent assets (a)	710	540
Accrued and Other Current Liabilities [Member]
Accrued and other current liabilities	301	249
Other Noncurrent Liabilities [Member]
Noncurrent operating lease liabilities	409	291
Other Liabilities [Member]
Total liabilities	$ 710	$ 540