Note 7 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ROU assets	$ 3,294	$ 15
Short-term lease liability	25	15
Long-term lease liability	3,109	0
Other Assets [Member]
ROU assets	3,294	15
Other Liabilities [Member]
Short-term lease liability	25	15
Other Noncurrent Liabilities [Member]
Long-term lease liability	$ 3,109	$ 0