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Note 11 - Long-term Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Long term debt $ 466,058 $ 604,641
Unamortized discount 5,718 9,111
Less: Amounts Due in One Year* [1] 4,102 36,589
Long-Term Debt 461,956 568,052
MEDCO Revenue Bonds in Series Due September 2025 at 5.75% [Member]    
Long term debt 102,865 102,865
PEDFA Solid Waste Disposal Revenue Bonds [Member]    
Long term debt 75,000 75,000
Term Loan A Facility [Member]    
Long term debt 0 41,250
Other Asset Backed Financing [Member]    
Long term debt 1,707 2,082
Advance Royalty Commitments [Member]    
Long term debt 4,858 4,858
Loans Payable [Member] | Term Loan B Facility [Member]    
Long term debt 163,239 238,590
Unamortized discount 351 687
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]    
Long term debt $ 124,107 $ 149,107
[1] Excludes current portion of Finance Lease Obligations of $22,238 and $20,743 at June 30, 2022 and December 31, 2021, respectively.