Note 2 - Major Transactions (Details Textual) $ in Thousands			12 Months Ended
		Oct. 22, 2020 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Stock Issued During Period, Shares, Acquisitions (in shares) | shares	[1]		7,967,690	0	0
Business Combination, Acquisition Related Costs			$ 9,822	$ 0	$ 0
Income (Loss) From Sale of Contracts			17,847	0	0
Gain (Loss) on Disposition of Assets, Total			15,295	1,995	$ 565
Settlement Transaction with Murray Energy [Member]
Income (Loss) From Sale of Contracts			18,561
Gain (Loss) on Disposition of Assets, Total			6,230
Income (Loss) From Expense Rebates Offset With Cure Costs			1,940
Other Receivables			4,867	$ 13,567
Other Assets, Total			$ 22,055
Public Unitholders [Member] | CCR [Member]
Ownership, Oustanding Common Units, Percent		39.30%
CONSOL Coal Resources L P [Member] | CCR [Member]
Ownership, Oustanding Common Units, Percent		60.70%
CONSOL Coal Resources L P [Member]
Stock Issued During Period, Shares, Acquisitions (in shares) | shares		7,967,690
Business Combination, Consideration Transferred, Equity Interest Acquired, Shares (in shares) | shares		10,912,138
Business Combination, Consideration Transferred, Equity Interests, Shares, Exchange Ratio		0.73
Business Combination, Consideration Transferred, Total		$ 51,710
CONSOL Coal Resources L P [Member] | Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs		$ 9,822

[1] See Note 2 - Major Transactions for additional information.