Note 7 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
2020	$ 1,328
2021	734
2022	390
2023	22
Total remaining lease payments	2,474
Less: imputed interest	(117)
Accrued Liabilities and Other Long-term Liabilities [Member]
Total lease liabilities	2,357
Accrued Liabilities, Current [Member]
Current liabilities	1,254	$ 0
Other Long-term Liabilities [Member]
Long-term liabilities	$ 1,103	$ 0