Derivative and Hedging Instruments (Details-3) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Collateral posted against derivative positions	$ 0	$ (1,500,000)
Commodity Derivative Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts	632,000	1,738,000
Gross amounts offset in balance sheet	(632,000)	(192,000)
Collateral posted against derivative positions	0	(1,546,000)
Net amount presented in the balance sheet	0	0
Financial Transmission Rights [Member]
Offsetting Liabilities [Line Items]
Gross amounts	23,000
Gross amounts offset in balance sheet	0
Collateral posted against derivative positions	0
Net amount presented in the balance sheet	23,000
PPA [Member]
Offsetting Liabilities [Line Items]
Gross amounts	14,140,000	25,440,000
Gross amounts offset in balance sheet	0	0
Collateral posted against derivative positions	0	0
Net amount presented in the balance sheet	$ 14,140,000	$ 25,440,000