Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Net Income from Discontinued Operations on the Condensed Consolidated Statements of Operations
Income from discontinued operations, net of income taxes	$ 332	$ 665	$ 988	$ 2,228
Assets and Liabilities Relating to PPT
Total liabilities held for sale	4,163		4,163		3,858
PPT
Net Income from Discontinued Operations on the Condensed Consolidated Statements of Operations
Revenue	7,479	12,092	23,384	35,884
Income from operations	562	1,147	1,688	3,842
Other expense	0	0	37	0
Income before income taxes	562	1,147	1,651	3,842
Income tax provision	230	482	663	1,614
Income from discontinued operations, net of income taxes	332	665	988	2,228
Assets and Liabilities Relating to PPT
Accounts receivable, net of allowances of $178 and $218	3,812		3,812		5,015
Other current assets	188		188		167
Property, plant and equipment, net of accumulated depreciation of $931 and $1,086	120		120		261
Total assets held for sale	4,120		4,120		5,443
Accounts payable	3,600		3,600		3,009
Accrued liabilities	0		0		1
Accrued compensation	563		563		848
Total liabilities held for sale	4,163		4,163		3,858
Allowance for doubtful accounts	178		178		218
Accumulated depreciation	$ 931		$ 931		$ 1,086
Sales | Pro Forma | Product Concentration Risk | PPT
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percent of total revenue	21.80%	38.30%	23.90%	39.90%