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Note 13 - Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long term debt $ 600,589 $ 685,855
Unamortized discount 9,921 10,323
Long-term Debt, Total 600,589 685,855
Long-term Debt, Current Maturities, Total [1] 33,731 32,053
Long-Term Debt 566,858 653,802
MEDCO Revenue Bonds in Series Due September 2025 at 5.75% [Member]    
Long term debt 102,865 102,865
Long-term Debt, Total 102,865 102,865
Term Loan A Facility [Member]    
Long term debt 66,250 88,750
Long-term Debt, Total 66,250 88,750
Other Asset Backed Financing [Member]    
Long term debt 2,813 9,289
Long-term Debt, Total 2,813 9,289
Advance Royalty Commitments [Member]    
Long term debt 2,185 1,895
Long-term Debt, Total 2,185 1,895
Loans Payable [Member] | Term Loan B Facility [Member]    
Long term debt 269,250 271,751
Unamortized discount 938 1,187
Long-term Debt, Total 269,250 271,751
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]    
Long term debt 167,147 221,628
Long-term Debt, Total $ 167,147 $ 221,628
[1] Excludes current portion of Finance Lease Obligations of $20,115 and $18,219 at December 31, 2020 and 2019, respectively.