Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended				1 Months Ended						12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Feb. 29, 2012 2002 Series A Bond of 6.2% Maturing 2012 [Member]	Dec. 31, 2012 Unbilled Retail Revenues [Member]	Dec. 31, 2011 Unbilled Retail Revenues [Member]	Dec. 31, 2012 ML&P For Fuel and South Central Power Project Costs [Member]	Dec. 31, 2011 ML&P For Fuel and South Central Power Project Costs [Member]	Dec. 31, 2012 Alaska Energy Authority For Grant [Member]	Dec. 31, 2012 Homer Electric Association, Inc. [Member]	Dec. 31, 2011 Homer Electric Association, Inc. [Member]	Dec. 30, 2011 UBS Financial Services [Member]	Dec. 31, 2012 Concentration Account [Member]	Dec. 31, 2011 Concentration Account [Member]	Dec. 31, 2012 Overnight Repurchase Agreement Account [Member]	Dec. 31, 2011 Overnight Repurchase Agreement Account [Member]	Jan. 12, 2012 Key Bank [Member]
Weighted average capital interest percentage	4.00%	4.10%	4.80%
Money market account	$ 2,829,397	$ 10,000,000											$ 10.0					$ 69,000,000
Average balance of cash account														8,942,631	6,481,639	100	5,210,009
Average interest rate of cash																0.00%	0.06%
Proceeds from issuance of long-term debt obligations					120,000,000
Number of years to return patronage capital after expiration of power agreement											5 years
Patronage capital payable	6,858,367	6,646,068									6,900,000	6,600,000
Minimum number of days past balances reviewed	90 days
Accounts receivable	46,650,901	42,373,995				8,548,660	8,977,409	3,000,000	4,800,000	4,000,000
Fuel cost over-recovery	13,710,049	0
Fuel cost under-recovery	0	1,213,484
Fuel and purchased power costs	147,941,346	165,041,227	138,410,915
Consumer deposits	2,400,000	2,200,000
Customer credits	1,900,000	1,700,000
Grant proceeds included in public utilities property plant and equipment carry value	30,500,000	4,300,000
Fuel stock	9,466,767	0
Marketable securities	$ 10,158,016	$ 0		$ 10,000,000