Note 1 - Basis of Presentation - Schedule of Basic and Dilutive Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net Income		$ 26,404	$ 2,475
Less: Net Income Attributable to Noncontrolling Interest		0	108
Net Income Attributable to CONSOL Energy Inc. Shareholders		$ 26,404	$ 2,367
Weighted-average shares of common stock outstanding (in shares)		34,206,632	25,987,155
Effect of dilutive shares (in shares)	[1]	837,450	265,056
Weighted-average diluted shares of common stock outstanding (in shares)		35,044,082	26,252,211
Basic (in dollars per share)		$ 0.77	$ 0.09
Dilutive (in dollars per share)		$ 0.75	$ 0.09

[1] During periods in which the Company incurs a net loss, diluted weighted average shares outstanding are equal to basic weighted average shares outstanding because the effect of all equity awards is anti-dilutive.