Note 9 - Operating Leases - Future Lease Payments (Details) $ in Thousands	Mar. 31, 2019 USD ($)
2019 (excluding the three months ending March 31, 2019)	$ 1,364
2020	1,852
2021	1,886
2022	2,133
2023	2,173
Thereafter	16,375
Total future minimum lease payments	25,783
Less imputed interest	(10,582)
Total lease liabilities	$ 15,201