Note 6 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long-term lease liability	$ 16,060	$ 15,707
Other Assets [Member]
ROU assets	48	59
Other Liabilities [Member]
Short-term lease liability	45	44
Other Noncurrent Liabilities [Member]
Long-term lease liability	$ 3	$ 15