Note 6 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease, 2020	$ 5,162
Finance lease, 2020	228
Operating lease, 2021	6,171
Finance lease, 2021	298
Operating lease, 2022	5,153
Finance lease, 2022	285
Operating lease, 2023	4,205
Finance lease, 2023	241
Operating lease, 2024	3,591
Finance lease, 2024	216
Operating lease, Thereafter	8,506
Finance lease, Thereafter	403
Operating lease, Total future minimum lease payments	32,788
Finance lease, Total future minimum lease payments	1,671
Operating lease, Less remaining imputed interest	(3,997)
Finance lease, Less remaining imputed interest	(178)
Operating lease, Total	28,791	$ 25,899
Finance lease, Total	$ 1,493	$ 551