Consolidated Statements of Comprehensive Income (Unaudited) (Parantheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Unrealized gain (loss) on available-for-sale securities, tax (benefit) expense	$ (56)	$ 63	$ (120)	$ 38
MGE [Member]
Unrealized gain (loss) on available-for-sale securities, tax (benefit) expense	$ (19)	$ 29	$ (92)	$ (36)