Chattel Paper Agreements (Details-1) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Cumulative effect of new accounting guidance, retained earnings		$ (142,000)
Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreement, maximum exposure	10,000,000
Repurchase-to-Maturity Transactions, loans due	4,266,000
Cumulative effect of new accounting guidance, retained earnings		(100,000)
2015 [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase-to-Maturity Transactions, loans due	383,000
2016 [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase-to-Maturity Transactions, loans due	950,000
2017 [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase-to-Maturity Transactions, loans due	552,000
2018 [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase-to-Maturity Transactions, loans due	540,000
Thereafter [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase-to-Maturity Transactions, loans due	1,841,000
Minimum [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
MGE guarantee to the financial institution, term	1 year
Maximum [Member] | Chattel Paper Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
MGE guarantee to the financial institution, term	10 years