Note 4 - Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Apr. 20, 2021	Dec. 31, 2020
Equipment finance leases (see Footnote 11)		$ 129		$ 734
Costs associated with issuances of debt		(9,332)		(977)
Total, notes		133,837		143,731
Current maturities of long-term debt		(26,976)		(143,731)
Long-term debt, net of current maturities		106,861		0
Senior Notes [Member] | Second Lien Notes [Member]
Long-term debt		116,193	$ 120,600	0
Total, notes		7,100	7,100	120,600
Senior Notes [Member] | New Second Lien Notes [Member]
Long-term debt		7,097	$ 116,200	120,569
Total, notes		116,200
Line of Credit [Member] | Revolving Credit Facility [Member]
Long-term debt	[1]	19,750		22,500
Other Debt [Member]
Long-term debt		$ 0		$ 905

[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").