WARRANTY RESERVES (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 1,868,000	$ 1,384,000	$ 1,846,000
Provision for warranty expense	2,647,000	2,068,000	1,228,000
Warranty costs incurred	(1,359,000)	(1,584,000)	(1,400,000)
Adjustment to pre-existing warranties	0	0	(290,000)
Balance at end of period	3,156,000	1,868,000	1,384,000
Non-current portion of warranty reserve	1,733,000	821,000	389,000
Current portion of warranty reserve	1,423,000	1,047,000	995,000
Instruments [Member] | Minimum [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments	1 year
Change in period of coverage for standard warranty obligations on certain instruments	3 years
Instruments [Member] | Maximum [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments	5 years
Change in period of coverage for standard warranty obligations on certain instruments	5 years
Reagent Discs [Member]
Change in accrued warranty reserve [Roll Forward]
Provision for warranty expense	200,000	500,000	400,000
Warranty reserve, balance at end of period	500,000	600,000
Current portion of warranty reserve	$ 513,000	$ 619,000