NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified			12 Months Ended				12 Months Ended			12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum	Mar. 31, 2013 Building and leasehold improvements	Mar. 31, 2012 Building and leasehold improvements	Mar. 31, 2013 Building and leasehold improvements Maximum	Mar. 31, 2013 Equipment and tooling	Mar. 31, 2012 Equipment and tooling	Mar. 31, 2013 Equipment and tooling Minimum	Mar. 31, 2013 Equipment and tooling Maximum	Mar. 31, 2013 Computer equipment and software	Mar. 31, 2012 Computer equipment and software	Mar. 31, 2013 Computer equipment and software Minimum	Mar. 31, 2013 Computer equipment and software Maximum	Mar. 31, 2013 Furniture and fixtures	Mar. 31, 2012 Furniture and fixtures	Mar. 31, 2013 Furniture and fixtures Minimum	Mar. 31, 2013 Furniture and fixtures Maximum	Mar. 31, 2013 Demo and test equipment	Mar. 31, 2012 Demo and test equipment	Mar. 31, 2013 Demo and test equipment Minimum	Mar. 31, 2013 Demo and test equipment Maximum	Mar. 31, 2013 Leased equipment	Mar. 31, 2012 Leased equipment	Mar. 31, 2013 Leased equipment Minimum	Mar. 31, 2013 Leased equipment Maximum	Mar. 31, 2013 Motor vehicles	Mar. 31, 2012 Motor vehicles	Mar. 31, 2013 Motor vehicles Minimum	Mar. 31, 2013 Motor vehicles Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives			1 year	25 years			25 years			5 years	10 years			3 years	5 years			5 years	7 years			2 years	5 years			1 year	2 years			3 years	5 years
Total	$ 59,931	$ 56,588			$ 21,245	$ 20,761		$ 5,284	$ 5,110			$ 23,135	$ 21,491			$ 2,553	$ 2,515			$ 7,579	$ 6,576			$ 63	$ 63			$ 72	$ 72
Less accumulated depreciation and amortization	(43,480)	(38,590)
Building, equipment and leasehold improvements, net	$ 16,451	$ 17,998