Note 7 - Commitments and Contingencies - Additional Lease Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating lease cost	$ 1,756
Short-term lease cost	291
Total lease cost	2,047
Cash paid for amounts included in the measurement of operating lease liabilities	1,858
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 10,571
Weighted average remaining lease term - operating leases (years) (Year)	8 years 109 days
Weighted average discount rate - operating leases	5.25%