Deferred Charges And Liabilities (Schedule Of Deferred Charges, Or Regulatory Assets, Not Currently Being Recovered In Rates Charged To Consumers) (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Regulatory Assets [Line Items]
Total deferred charges	$ 25,140,957	$ 16,811,756
Total deferred charges	25,140,957	16,811,756
Regulatory Assets Excluding Other Deferred Charges [Member]
Regulatory Assets [Line Items]
Total deferred charges	17,156,807	16,610,856
NRECA Retirement Security Plan [Member]
Regulatory Assets [Line Items]
Total deferred charges	7,925,050	0
Post Retirement Benefit Obligation [Member]
Regulatory Assets [Line Items]
Total deferred charges	59,100	200,900
Other Regulatory Deferred Charges [Member]
Regulatory Assets [Line Items]
Total deferred charges	849,933	1,056,909
Not Currently Being Recovered In Rates Charged to Consumers [Member]
Regulatory Assets [Line Items]
Total deferred charges	9,148,731	686,348
Not Currently Being Recovered In Rates Charged to Consumers [Member] | Multi-Stage Energy Storage [Member]
Regulatory Assets [Line Items]
Total deferred charges	1,117,860	124,569
Not Currently Being Recovered In Rates Charged to Consumers [Member] | Regulatory Studies And Other [Member]
Regulatory Assets [Line Items]
Total deferred charges	46,721	360,879
Not Currently Being Recovered In Rates Charged to Consumers [Member] | Regulatory Assets Excluding Other Deferred Charges [Member]
Regulatory Assets [Line Items]
Total deferred charges	1,164,581	485,448
Not Currently Being Recovered In Rates Charged to Consumers [Member] | NRECA Retirement Security Plan [Member]
Regulatory Assets [Line Items]
Total deferred charges	7,925,050	0
Not Currently Being Recovered In Rates Charged to Consumers [Member] | Post Retirement Benefit Obligation [Member]
Regulatory Assets [Line Items]
Total deferred charges	59,100	200,900
Not Currently Being Recovered In Rates Charged to Consumers [Member] | Other Regulatory Deferred Charges [Member]
Regulatory Assets [Line Items]
Total deferred charges	$ 7,984,150	$ 200,900