Note 7 - Leases - Future Minimum Lease payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
2019	$ 9,677	$ 12,206
2020	10,868	9,901
2021	10,436	9,716
2022	9,968	9,236
2023	9,641	8,936
Thereafter	136,721	115,788
Total minimum lease payments	187,311	165,783
Less imputed interest	(90,178)
Operating lease liabilities	$ 97,133