Consolidated Statements Of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements Of Operations [Abstract]
Operating revenues	$ 49,405,607	$ 45,132,973	$ 161,753,739	$ 140,005,625
Operating expenses:
Fuel	17,291,134	11,825,993	55,487,263	37,661,493
Production	4,711,160	4,218,378	12,951,877	12,111,405
Purchased power	3,089,568	3,067,950	11,739,475	11,258,778
Transmission	1,548,215	1,653,494	4,598,273	4,369,240
Distribution	4,080,959	3,769,984	10,368,772	10,530,563
Consumer accounts	1,483,127	1,509,664	4,580,216	4,704,764
Administrative, general and other	4,666,137	5,010,460	17,776,742	17,068,780
Depreciation and amortization	7,980,294	9,252,379	26,936,964	26,435,059
Total operating expenses	44,850,594	40,308,302	144,439,582	124,140,082
Interest expense:
Long-term debt and other	5,616,675	5,507,173	16,733,184	16,343,393
Charged to construction	(46,714)	(79,734)	(107,712)	(283,338)
Interest expense, net	5,569,961	5,427,439	16,625,472	16,060,055
Net operating margins	(1,014,948)	(602,768)	688,685	(194,512)
Nonoperating margins:
Interest income	164,207	89,118	471,038	253,455
Allowance for funds used during construction	19,555	32,978	45,219	117,189
Capital credits, patronage dividends and other	23,751	3,236	105,049	5,636
Total nonoperating margins	207,513	125,332	621,306	376,280
Assignable margins	$ (807,435)	$ (477,436)	$ 1,309,991	$ 181,768