Discontinued Operations and Assets Held for Sale (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	May 21, 2010
Results of discontinued operations [Abstract]
Net sales		$ 364,000		$ 25,177,000
Cost of sales		(1,681,000)		(26,873,000)
Operating expenses		0		(3,676,000)
Income tax benefit	0	163,000	0	239,000
Net loss from discontinued operations	0	(1,154,000)	0	(5,133,000)
Amount of assets disposed of in sale of various parts of the SST acquisition					$ 23,600,000