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Note 17 - Related Party Transactions (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 05, 2020
Aug. 31, 2019
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Nov. 28, 2019
USD ($)
May 31, 2019
USD ($)
Common Unit Shares Issued Upon Conversion   1              
CONSOL Coal Resources L P Units Member                  
Conversion of Stock, Shares Converted (in shares) | shares   11,611,067              
Stock and Debt Repurchase Program, Restricted Authorized Amount                 $ 50,000
CONSOL Coal Resources L P Member                  
Accounts Payable, Related Parties, Current     $ 4,731   $ 4,731   $ 1,419    
Stock and Debt Repurchase Program, Restricted Authorized Amount                 $ 50,000
CONSOL Coal Resources L P Member                  
Stock Purchased During Period, Affiliated Entity Units (in shares) | shares     0 6,884 0 6,884      
Stock Purchased, Affiliated Entity, Average Cost Per Share (in dollars per share) | $ / shares       $ 17.35   $ 17.35      
CNX Resources Corporation [Member]                  
Notes Receivable, Related Parties             $ 6,791    
Affiliated Company Credit Agreement [Member] | Affiliated Entity [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity               $ 275,000  
Long-term Line of Credit, Total               $ 201,000  
Affiliated Company Credit Agreement [Member] | Affiliated Entity [Member] | CONSOL Coal Resources L P Member                  
Interest Expense, Related Party     $ 2,163 $ 1,971 $ 4,277 $ 3,766      
Affiliated Company Credit Agreement [Member] | Affiliated Entity [Member] | CONSOL Coal Resources L P Member | Minimum [Member]                  
Debt Instrument, Interest Rate, Stated Percentage               4.25%  
Affiliated Company Credit Agreement [Member] | Affiliated Entity [Member] | CONSOL Coal Resources L P Member | Maximum [Member]                  
Debt Instrument, Interest Rate, Stated Percentage               5.25%  
Affiliated Company Credit Agreement [Member] | Affiliated Entity [Member] | Senior Secured Revolving Credit Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity               $ 400,000  
Debt Instrument, Interest Rate, Increase (Decrease) 0.50%