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Members’/Shareholders' Equity - Cash Distributions (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 04, 2021
USD ($)
$ / shares
Feb. 26, 2021
Feb. 04, 2021
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Equity [Abstract]                          
Total Distribution | $ $ 5.0   $ 3.8 $ 5.5 $ 0.0 $ 8.8 $ 3.8 $ 2.5 $ 2.5 $ 5.0 $ 5.0 $ 18.1 $ 15.0
Dividends Payable [Line Items]                          
Cash dividend declared (USD per Share/Unit) | $ / shares $ 0.28     $ 0.28 $ 0 $ 0.29 $ 0.30 $ 0.20 $ 0.20 $ 0.40 $ 0.40    
Reverse stock split                       0.083  
Tengasco                          
Dividends Payable [Line Items]                          
Reverse stock split   0.083                      
Stock conversion ratio   97.796467