Statements Of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statements Of Operations [Abstract]
Operating revenues	$ 45,132,973	$ 43,109,512	$ 140,005,625	$ 165,780,449
Operating expenses:
Fuel	11,825,993	10,042,130	37,661,493	53,059,968
Production	4,218,378	3,960,888	12,111,405	12,618,185
Purchased power	3,067,950	4,306,447	11,258,778	15,642,645
Transmission	1,653,494	1,554,417	4,369,240	4,608,043
Distribution	3,769,984	3,846,034	10,530,563	10,687,875
Consumer accounts	1,509,664	1,541,648	4,704,764	4,669,254
Administrative, general and other	5,010,460	5,845,187	17,068,780	17,989,910
Depreciation and amortization	9,252,379	8,570,795	26,435,059	27,333,500
Total operating expenses	40,308,302	39,667,546	124,140,082	146,609,380
Interest expense:
Long-term debt and other	5,507,173	5,475,837	16,343,393	16,688,389
Charged to construction	(79,734)	(47,063)	(283,338)	(289,075)
Interest expense, net	5,427,439	5,428,774	16,060,055	16,399,314
Net operating margins	(602,768)	(1,986,808)	(194,512)	2,771,755
Nonoperating margins:
Interest income	89,118	74,440	253,455	221,277
Allowance for funds used during construction	32,978	17,702	117,189	108,737
Capital credits, patronage dividends and other	3,236	(13,114)	5,636	(10,714)
Total nonoperating margins	125,332	79,028	376,280	319,300
Assignable margins	$ (477,436)	$ (1,907,780)	$ 181,768	$ 3,091,055