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Note 13 - Long-term Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Long term debt $ 634,713 $ 685,855
Unamortized discount 10,759 10,323
Less: Amounts Due in One Year* [1] 47,693 32,053
Long-Term Debt 587,020 653,802
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 72,500 88,750
Other Asset Backed Financing [Member]    
Long term debt 21,885 9,289
Advance Royalty Commitments [Member]    
Long term debt 1,895 1,895
Loans Payable [Member] | Term Loan B Facility [Member]    
Long term debt 269,875 271,751
Unamortized discount 1,000 1,187
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]    
Long term debt $ 176,452 $ 221,628
[1] Excludes current portion of Finance Lease Obligations of $21,261 and $18,219 at September 30, 2020 and December 31, 2019, respectively.