Note 16 - Additional Information With Respect to Unrestricted Subsidiaries - Income Statement (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue		$ 121,296		$ 371,182		$ 396,396	$ 728,165
Miscellaneous Other Income		33,936		12,194		50,106	25,486
Gain (Loss) on Sale of Assets		7,329		933		7,315	1,272
Total Revenue and Other Income		162,561		384,309		453,817	754,923
Operating and Other Costs		116,406		253,448		328,681	483,561
Depreciation, Depletion and Amortization		46,155		46,151		101,098	96,875
Freight Expense		3,085		3,854		6,232	10,516
Selling, General and Administrative Costs		10,939		16,288		28,609	38,211
Interest Expense, net		14,722		16,046		30,393	34,642
Total Costs and Expenses		191,307		337,287		478,180	688,448
(Loss) Earnings Before Income Tax		(28,746)		47,022		(24,363)	66,475
Income Tax Benefit		(7,683)		(1,808)		(5,775)	(2,658)
Net Income (loss)		(21,063)	$ 2,475	48,830	$ 20,303	(18,588)	69,133
Less: Net (Loss) Income Attributable to Noncontrolling Interest		(3,080)		5,550		(2,972)	11,418
Net (Loss) Income Attributable to CONSOL Energy Inc. Shareholders		(17,983)		43,280		(15,616)	57,715
Loss on Debt Extinguishment		(0)		(1,500)		16,833	(24,643)
(Gain) Loss on Debt Extinguishment		0		1,500		(16,833)	24,643
Loss on Debt Extinguishment		(0)		(1,500)		16,833	(24,643)
Loss (Gain) on Debt Extinguishment		0		1,500		(16,833)	24,643
Coal Revenue [Member]
Revenue	[1]	102,313		350,620		357,765	683,123
Terminal Revenue [Member]
Revenue		15,898		16,708		32,399	34,526
Freight Revenue [Member]
Revenue		3,085		3,854		6,232	10,516
Parent Company and Restricted Subsidiaries [Member]
Miscellaneous Other Income		16,802		(7,844)		20,665	4,137
Gain (Loss) on Sale of Assets		7,329		943		7,315	1,277
Total Revenue and Other Income		119,149		275,662		333,448	560,169
Operating and Other Costs		91,325		194,580		254,917	372,184
Depreciation, Depletion and Amortization		34,635		34,815		77,650	74,322
Freight Expense		2,314		2,890		4,674	7,887
Selling, General and Administrative Costs		8,579		13,335		22,203	30,698
Interest Expense, net		12,468		14,489		25,984	31,734
Total Costs and Expenses		149,321		261,609		368,595	541,468
(Loss) Earnings Before Income Tax		(30,172)		14,053		(35,147)	18,701
Income Tax Benefit		(7,683)		(1,808)		(5,775)	(2,658)
Net Income (loss)		(22,489)		15,861		(29,372)	21,359
Less: Net (Loss) Income Attributable to Noncontrolling Interest		(3,080)		5,550		(2,972)	11,418
Net (Loss) Income Attributable to CONSOL Energy Inc. Shareholders		(19,409)		10,311		(26,400)	9,941
Loss on Debt Extinguishment				(1,500)		16,833	24,643
(Gain) Loss on Debt Extinguishment				1,500		(16,833)	(24,643)
Loss on Debt Extinguishment				(1,500)		16,833	24,643
Loss (Gain) on Debt Extinguishment				1,500		(16,833)	(24,643)
Parent Company and Restricted Subsidiaries [Member] | Coal Revenue [Member]
Revenue		76,806		262,965		268,395	512,342
Parent Company and Restricted Subsidiaries [Member] | Terminal Revenue [Member]
Revenue		15,898		16,708		32,399	34,526
Parent Company and Restricted Subsidiaries [Member] | Freight Revenue [Member]
Revenue		2,314		2,890		4,674	7,887
Subsidiaries [Member]
Miscellaneous Other Income		17,134		20,038		29,441	21,349
Gain (Loss) on Sale of Assets		0		(10)		0	(5)
Total Revenue and Other Income		43,412		108,647		120,369	194,754
Operating and Other Costs		25,081		58,868		73,764	111,377
Depreciation, Depletion and Amortization		11,520		11,336		23,448	22,553
Freight Expense		771		964		1,558	2,629
Selling, General and Administrative Costs		2,360		2,953		6,406	7,513
Interest Expense, net		2,254		1,557		4,409	2,908
Total Costs and Expenses		41,986		75,678		109,585	146,980
(Loss) Earnings Before Income Tax		1,426		32,969		10,784	47,774
Income Tax Benefit		0		0		0	0
Net Income (loss)		1,426		32,969		10,784	47,774
Less: Net (Loss) Income Attributable to Noncontrolling Interest		0		0		0	0
Net (Loss) Income Attributable to CONSOL Energy Inc. Shareholders		1,426		32,969		10,784	47,774
Loss on Debt Extinguishment				(0)		(0)	0
(Gain) Loss on Debt Extinguishment				0		0	0
Loss on Debt Extinguishment				(0)		(0)	0
Loss (Gain) on Debt Extinguishment				0		0	0
Subsidiaries [Member] | Coal Revenue [Member]
Revenue		25,507		87,655		89,370	170,781
Subsidiaries [Member] | Terminal Revenue [Member]
Revenue		0		0		0	0
Subsidiaries [Member] | Freight Revenue [Member]
Revenue		$ 771		$ 964		$ 1,558	$ 2,629

[1] For the three and six months ended June 30, 2020 and 2019, the PAMC segment had revenues from the following customers, each comprising over 10% of the Company’s total sales