Note 8 - Lease - Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amortization of right-of-use assets	$ 1,018	$ 1,406	$ 3,023	$ 4,225
Interest on lease liabilities	284	210	808	644
Operating lease cost	5,734	6,167	19,782	17,824
Variable lease cost	44	0	358	0
Total lease cost	7,080	7,783	23,971	22,693
Operating cash flows from finance leases	1,018	1,146	3,023	3,589
Operating cash flows from operating leases	5,778	6,167	20,140	17,824
Financing cash flows from finance leases	284	210	808	644
Right-of-use assets obtained in exchange for new finance lease liabilities	1,131	0	3,258	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 122	$ 20,096	$ 2,759	$ 26,421
Weighted-average remaining lease term—finance leases (Year)	1 year 9 months 18 days		1 year 9 months 18 days
Weighted-average remaining lease term—operating leases (Year)	2 years 6 months		2 years 6 months
Weighted-average discount rate—finance leases	4.20%		4.20%
Weighted-average discount rate—operating leases	5.20%		5.20%