WARRANTY RESERVES (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 1,384,000	$ 1,846,000	$ 1,222,000
Provision for warranty expense	2,068,000	1,228,000	1,698,000
Warranty costs incurred	(1,584,000)	(1,400,000)	(1,331,000)
Adjustment to pre-existing warranties	0	(290,000)	257,000
Balance at end of period	1,868,000	1,384,000	1,846,000
Non-current portion of warranty reserve	821,000	389,000	601,000
Current portion of warranty reserve	1,047,000	995,000	1,245,000
Instruments [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments (in years)	one to five
Change in period of coverage for standard warranty obligations on certain instruments (in years)	three to five
Reagent Discs [Member]
Change in accrued warranty reserve [Roll Forward]
Provision for warranty expense	518,000	369,000	456,000
Warranty reserve, balance at end of period	619,000	571,000
Current portion of warranty reserve	$ 619,000	$ 571,000