Note 8 - Lease Obligations - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
2021, Operating	[1]	$ 13,837
2021, Finance	[1]	6,736
2022, Operating		15,613
2022, Finance		7,678
2023, Operating		6,852
2023, Finance		1,607
2024, Operating		49
2024, Finance		0
2025, Operating		9
2025, Finance		0
Thereafter, Operating		0
Thereafter, Finance		0
Total minimum lease payments, Operating		36,360
Total minimum lease payments, Finance		16,021
Less: amount representing interest, Operating		(1,984)
Less: amount representing interest, Finance		(211)
Present value of minimum lease payments, Operating		34,376
Present value of minimum lease payments, Finance		15,810
Less: current portion, Operating		(16,844)	$ (16,989)
Less: current portion, Finance		(6,147)	(5,687)
Lease obligations, long-term, Operating		17,532
Lease obligations, long-term, Finance		$ 9,663	$ 10,756

[1] Excludes the three months ended March 31, 2021.