Income Tax (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax (Textual) [Abstract]
Recognized federal research and development tax credits	$ 1,560	$ 1,196	$ 1,461
State research and development tax credits	380	251	145
Qualified production activities deduction under Section 199 of the Internal Revenue Code	5,528	3,189	9,032
Accrued interest related to income tax	$ 332	$ 80
Period within which the company does not anticipate total unrecognized tax benefits to change	within the next twelve months