Other Equities (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Other	$ 11,372,355		$ 11,358,692
Nonoperating Margins Prior To 1967 [Member]
Other	23,625		23,625
Donated Capital [Member]
Other	1,647,869		1,621,257
Unclaimed Capital Credit Retirement [Member]
Other	$ 9,700,861	[1]	$ 9,713,810	[1]

[1] Represents unclaimed capital credits that have met all requirements of section 34.45.200 of Alaska’s unclaimed property law and has therefore reverted to Chugach