Note 4 - Long-term Debt - Summary of Long-term Debt and Lease Obligation (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Equipment finance leases (see Footnote 11)		$ 435	$ 734
Costs associated with issuances of debt		(735)	(977)
Total		141,970	143,731
Current maturities of long-term debt		(29,233)	(143,731)
Long-term debt, net of current maturities		112,737	0
Line of Credit [Member] | Revolving Credit Facility [Member]
Long-term debt	[1]	21,250	22,500
Other Debt [Member]
Long-term debt		451	905
Second Lien Notes [Member] | Senior Notes [Member]
Long-term debt		$ 120,569	$ 120,569

[1] The maturity of the revolving credit facility will accelerate if the Company is unable to repay or extend the maturity of the Existing Second Lien Notes (see detailed discussion below in "Revolving Credit Facility").