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Note 12 - Long-term Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Long term debt $ 641,077 $ 685,855
Unamortized discount 11,478 10,323
Less: Amounts Due in One Year* [1] 45,717 32,053
Long-Term Debt 595,360 653,802
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 78,750 88,750
Other Asset Backed Financing [Member]    
Long term debt 20,092 9,289
Advance Royalty Commitments [Member]    
Long term debt 1,895 1,895
Loans Payable [Member] | Term Loan B Facility [Member]    
Long term debt 270,501 271,751
Unamortized discount 1,062 1,187
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]    
Long term debt $ 178,452 $ 221,628
[1] Excludes current portion of Finance Lease Obligations of $21,208 and $18,219 at June 30, 2020 and December 31, 2019, respectively.