Consolidated Statements of Comprehensive Income (Unaudited) (Parantheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Unrealized gain (loss) on available-for-sale securities, tax (benefit) expense	$ (31)	$ 50	$ (26)	$ 93
MGE [Member]
Unrealized gain (loss) on available-for-sale securities, tax (benefit) expense	$ (77)	$ 1	$ (66)	$ 19