Note 24 - Segment Information - Industry Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue		$ 1,261,034	$ 879,462	$ 1,375,559
Adjusted EBITDA		378,246	261,523	405,936
Assets, Total		2,573,517	2,523,366	2,693,802
Depreciation, Depletion and Amortization		224,583	210,760	207,097
Capital Expenditures		132,752	86,004	169,739
Coal Revenue [Member]
Revenue	[1]	1,092,022	772,662	1,288,529
Terminal Revenue [Member]
Revenue		65,193	66,810	67,363
Freight Revenue [Member]
Revenue		103,819	39,990	19,667
Intersegment Eliminations [Member]
Revenue		0	0	0
Adjusted EBITDA		0	0	0
Assets, Total		0	0	0
Depreciation, Depletion and Amortization		0	0	0
Capital Expenditures		0	0	0
Intersegment Eliminations [Member] | Coal Revenue [Member]
Revenue	[1]	0	0	0
Intersegment Eliminations [Member] | Terminal Revenue [Member]
Revenue		0	0	0
Intersegment Eliminations [Member] | Freight Revenue [Member]
Revenue		0	0	0
Pennsylvania Mining Complex [Member] | Operating Segments [Member]
Revenue		1,188,899	811,353	1,308,196
Adjusted EBITDA		360,480	228,211	394,354
Assets, Total		1,773,609	1,864,514	1,981,721
Depreciation, Depletion and Amortization		206,727	198,272	185,616
Capital Expenditures		100,896	70,195	148,709
Pennsylvania Mining Complex [Member] | Operating Segments [Member] | Coal Revenue [Member]
Revenue	[1]	1,085,080	771,363	1,288,529
Pennsylvania Mining Complex [Member] | Operating Segments [Member] | Terminal Revenue [Member]
Revenue		0	0	0
Pennsylvania Mining Complex [Member] | Operating Segments [Member] | Freight Revenue [Member]
Revenue		103,819	39,990	19,667
CONSOL Marine Terminal [Member] | Operating Segments [Member]
Revenue		65,193	66,810	67,363
Adjusted EBITDA		43,491	44,356	44,491
Assets, Total		108,877	108,711	87,558
Depreciation, Depletion and Amortization		4,834	5,095	4,078
Capital Expenditures		974	1,455	6,675
CONSOL Marine Terminal [Member] | Operating Segments [Member] | Coal Revenue [Member]
Revenue	[1]	0	0	0
CONSOL Marine Terminal [Member] | Operating Segments [Member] | Terminal Revenue [Member]
Revenue		65,193	66,810	67,363
CONSOL Marine Terminal [Member] | Operating Segments [Member] | Freight Revenue [Member]
Revenue		0	0	0
Other Segments [Member] | Operating Segments [Member]
Revenue		6,942	1,299	0
Adjusted EBITDA		(25,725)	(11,044)	(32,909)
Assets, Total		691,031	550,141	624,523
Depreciation, Depletion and Amortization		13,022	7,393	17,403
Capital Expenditures		30,882	14,354	14,355
Other Segments [Member] | Operating Segments [Member] | Coal Revenue [Member]
Revenue	[1]	6,942	1,299	0
Other Segments [Member] | Operating Segments [Member] | Terminal Revenue [Member]
Revenue		0	0	0
Other Segments [Member] | Operating Segments [Member] | Freight Revenue [Member]
Revenue		$ 0	$ 0	$ 0

[1] For the three and six months ended September 30, 2021 and 2020, the PAMC segment had revenues from the following customers, each comprising over 10% of the Company's total sales