Note 8 - Lease Obligations - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
2021, Operating	[1]	$ 9,274
2021, Finance	[1]	6,444
2022, Operating		15,954
2022, Finance		7,137
2023, Operating		7,203
2023, Finance		1,423
2024, Operating		411
2024, Finance		0
2025, Operating		382
2025, Finance		0
Thereafter, Operating		2,221
Thereafter, Finance		0
Total minimum lease payments, Operating		35,445
Total minimum lease payments, Finance		15,004
Less: amount representing interest, Operating		(3,076)
Less: amount representing interest, Finance		(42)
Present value of minimum lease payments, Operating		32,369
Present value of minimum lease payments, Finance		14,962
Less: current portion, Operating		(16,595)	$ (16,989)
Less: current portion, Finance		(6,214)	(5,687)
Lease obligations, long-term, Operating		15,774
Lease obligations, long-term, Finance		$ 8,748	$ 10,756

[1] Excludes the six months ended June 30, 2021.