Note 7 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Long-term Assets [Member]
Operating lease ROU assets	$ 6,297	$ 3,719
Other Accrued Liabilities [Member]
Operating lease liabilities	2,539	1,406
Other Long-term Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 3,268	$ 1,693