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Note 18 - Stock and Debt Repurchases (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
May 31, 2020
Dec. 31, 2017
Nov. 30, 2017
Stock Repurchased and Retired During Period, Shares (in shares) 0        
CONSOL Coal Resources L P [Member]          
Stock and Debt Repurchase Program, Authorized Amount     $ 270,000    
Senior Secured Second Lien Notes due 2025 [Member]          
Repayments of Debt $ 9,338 $ 25,480      
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]          
Debt Instrument, Interest Rate, Stated Percentage 11.00% 11.00%   11.00% 11.00%
Repayments of Debt $ 9,338 $ 25,480      
Debt Instrument, Repurchased Face Amount $ 10,190 $ 43,176