Discontinued Operations and Assets Held for Sale (Details) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Results of discontinued operations [Abstract]
Net sales						$ 25,177,000
Cost of sales						(32,627,000)
Operating expenses						(3,676,000)
Income tax benefit					0	909,000	0
Net loss from discontinued operations	(5,084,000)	(1,154,000)	(1,668,000)	(2,311,000)	0	(10,217,000)	0
Amount of assets disposed of in sale of various parts of the SST acquisition						$ 23,600,000