Note 8 - Common Stock	9 Months Ended
Sep. 30, 2020
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	Note 8. Common Stock Class A Common Stock At September 30, 2020 and December 31, 2019, there were 30,210,749 and 29,421,131 shares of Class A Common Stock issued and outstanding, respectively. During the three and nine months ended September 30, 2020, as a result of the vesting and settlement of restricted stock units under the Earthstone Energy, Inc. Amended and Restated 2014 Long-Term Incentive Plan, as amended (the “2014 Plan”), Earthstone issued 195,344 and 726,082 shares, respectively, of Class A Common Stock, of which 54,268 and 187,773 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. During the three and nine months ended September 30, 2019, as a result of the vesting and settlement of restricted stock units under the 2014 Plan, Earthstone issued 167,827 and 569,883 shares, respectively, of Class A Common Stock, of which 49,111 and 151,716 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. Additionally, as discussed below, shares of Class A Common Stock were issued as the result of conversions of Class B Common Stock. Class B Common Stock At September 30, 2020 and December 31, 2019, there were 35,009,371 and 35,260,680 shares of Class B Common Stock issued and outstanding, respectively. Each share of Class B Common Stock, together with one EEH Unit, is convertible into one share of Class A Common Stock. During the three and nine months ended September 30, 2020, 49,316 and 251,309 shares, respectively, of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock. During the three and nine months ended September 30, 2019, 35,732 shares of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock.

Note 8 - Common Stock

9 Months Ended

Sep. 30, 2020

Stockholders' Equity Note Disclosure [Text Block]

Note 8. Common Stock

Class A Common Stock

At September 30, 2020 and December 31, 2019, there were 30,210,749 and 29,421,131 shares of Class A Common Stock issued and outstanding, respectively. During the three and nine months ended September 30, 2020, as a result of the vesting and settlement of restricted stock units under the Earthstone Energy, Inc. Amended and Restated 2014 Long-Term Incentive Plan, as amended (the “2014 Plan”), Earthstone issued 195,344 and 726,082 shares, respectively, of Class A Common Stock, of which 54,268 and 187,773 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. During the three and nine months ended September 30, 2019, as a result of the vesting and settlement of restricted stock units under the 2014 Plan, Earthstone issued 167,827 and 569,883 shares, respectively, of Class A Common Stock, of which 49,111 and 151,716 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. Additionally, as discussed below, shares of Class A Common Stock were issued as the result of conversions of Class B Common Stock.

Class B Common Stock

At September 30, 2020 and December 31, 2019, there were 35,009,371 and 35,260,680 shares of Class B Common Stock issued and outstanding, respectively. Each share of Class B Common Stock, together with one EEH Unit, is convertible into one share of Class A Common Stock. During the three and nine months ended September 30, 2020, 49,316 and 251,309 shares, respectively, of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock. During the three and nine months ended September 30, 2019, 35,732 shares of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock.