Note 1 - Significant Accounting Policies - Schedule of Basic and Dilutive Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income (Loss)		$ 34,110	$ (13,214)	$ 93,558
Less: Net (Loss) Income Attributable to Noncontrolling Interest		0	(3,459)	17,557
Net Income (Loss) Attributable to CONSOL Energy Inc. Stockholders		$ 34,110	$ (9,755)	$ 76,001
Weighted-average shares of common stock outstanding (in shares)		34,404,360	26,066,971	26,938,339
Effect of dilutive shares * (in shares)	[1]	984,198	0	132,769
Weighted-average diluted shares of common stock outstanding (in shares)		35,388,558	26,066,971	27,071,108
Basic (in dollars per share)		$ 0.99	$ (0.37)	$ 2.82
Dilutive (in dollars per share)		$ 0.96	$ (0.37)	$ 2.81

[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.