Note 7 - Leases - Lease Obligations (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Amortization of right-of-use assets	$ 5,469
Interest on lease liabilities	1,107
Operating lease cost	24,393
Variable lease cost	326
Total lease cost	31,295
Operating cash flows for finance leases	7,226
Operating cash flows for operating leases	24,393
Financing cash flows for finance leases	1,107
Right-of-use assets obtained in exchange for new finance lease liabilities
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 37,080
Weighted-average remaining lease term—finance leases (Year)	2 years 328 days
Weighted-average remaining lease term—operating leases (Year)	3 years 146 days
Weighted-average discount rate—finance leases	3.00%
Weighted-average discount rate—operating leases	5.20%