Note 1 - Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Property, Plant, and Equipment, Useful Life [Table Text Block]

	Years
Buildings and improvements		10 to 45
Machinery and equipment		3 to 25
Leasehold improvements		Life of Lease

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	For the Years Ended
	December 31,
	2020		2019		2018
Anti-Dilutive Restricted Stock Units		1,400,950		175,752		620
Anti-Dilutive Performance Share Units		110,470		20,202		6,363
		1,511,420		195,954		6,983

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	For the Years Ended
Dollars in thousands, except per share data	December 31,
	2020			2019		2018
Numerator:
Net (Loss) Income	$	(13,214	)	$	93,558	$	178,785
Less: Net (Loss) Income Attributable to Noncontrolling Interest		(3,459	)		17,557		25,809
Net (Loss) Income Attributable to CONSOL Energy Inc. Shareholders	$	(9,755	)	$	76,001	$	152,976
Denominator:
Weighted-average shares of common stock outstanding		26,066,971			26,938,339		27,928,245
Effect of dilutive shares *		—			132,769		491,517
Weighted-average diluted shares of common stock outstanding		26,066,971			27,071,108		28,419,762
(Loss) Earnings per Share:
Basic	$	(0.37	)	$	2.82	$	5.48
Dilutive	$	(0.37	)	$	2.81	$	5.38

Schedule of Stock by Class [Table Text Block]

	2020		2019			2018
Balance, Beginning of Year		25,932,618		27,437,844			27,973,281
Issuance Related to CCR Merger (1)		7,967,690		—			—
Retirement Related to Stock Repurchase (2)		—		(1,717,497	)		(708,245	)
Issuance Related to Stock-Based Compensation (3)		131,066		212,271			172,808
Balance, End of Year		34,031,374		25,932,618			27,437,844