Consolidated Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements Of Operations [Abstract]
Operating revenues	$ 45,988,583	$ 51,554,650	$ 102,045,861	$ 112,348,132
Operating expenses:
Fuel	12,554,088	17,476,837	31,041,678	38,196,129
Production	4,183,286	4,283,746	8,607,205	8,240,717
Purchased power	4,212,015	4,153,184	8,294,903	8,649,907
Transmission	1,741,184	1,400,259	3,729,188	3,050,058
Distribution	3,885,589	3,246,879	7,621,549	6,287,814
Consumer accounts	1,651,942	1,572,888	3,517,651	3,097,089
Administrative, general and other	5,870,304	6,800,539	11,415,273	13,110,605
Depreciation and amortization	7,394,219	9,431,420	14,737,296	18,956,671
Total operating expenses	41,492,627	48,365,752	88,964,743	99,588,990
Interest expense:
Long-term debt and other	5,501,411	5,565,158	11,116,146	11,116,509
Charged to construction	(67,498)	(30,127)	(124,861)	(60,999)
Interest expense, net	5,433,913	5,535,031	10,991,285	11,055,510
Net operating margins	(937,957)	(2,346,133)	2,089,833	1,703,632
Nonoperating margins:
Interest income	191,113	156,109	350,696	306,831
Allowance for funds used during construction	28,125	12,611	51,998	25,664
Capital credits, patronage dividends and other	(108,815)	33,196	(192,101)	81,298
Total nonoperating margins	110,423	201,916	210,593	413,793
Assignable margins	$ (827,534)	$ (2,144,217)	$ 2,300,426	$ 2,117,425