Annual report pursuant to Section 13 and 15(d)

Notes Payable (Details)

v3.19.3.a.u2
Notes Payable (Details)
$ in Millions
12 Months Ended
Oct. 23, 2013
item
Oct. 15, 2013
USD ($)
Dec. 31, 2019
Sweetwater IDR Bond [Member]      
Notes Payable      
Proceeds from Issuance of Long-term Debt | $   $ 34.0  
State Bond Loan [Member]      
Notes Payable      
Debt Instrument, Maturity Date Oct. 01, 2021   Apr. 01, 2023
Due Quarterly Commencing From January 1, 2014 [Member] | State Bond Loan [Member]      
Notes Payable      
Fixed interest rate (as a percent) 5.75%    
Due Quarterly Commencing From January 1, 2015 [Member] | State Bond Loan [Member]      
Notes Payable      
Number of installments | item 28