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Note 13 - Long-term Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Long term debt $ 579,333 $ 600,589
Unamortized discount 9,083 9,921
Long-term Debt, Current Maturities, Total [1] 28,889 33,731
Long-Term Debt 550,444 566,858
MEDCO Revenue Bonds in Series Due September 2025 at 5.75% [Member]    
Long term debt 102,865 102,865
Term Loan A Facility [Member]    
Long term debt 60,000 66,250
Other Asset Backed Financing [Member]    
Long term debt 2,632 2,813
Advance Royalty Commitments [Member]    
Long term debt 2,185 2,185
Loans Payable [Member] | Term Loan B Facility [Member]    
Long term debt 263,777 269,250
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]    
Long term debt $ 156,957 $ 167,147
[1] Excludes current portion of Finance Lease Obligations of $21,261 and $18,219 at September 30, 2020 and December 31, 2019, respectively.