WARRANTY RESERVES (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 1,613,000	$ 1,480,000	$ 1,384,000	$ 1,846,000
Provision for warranty expense	650,000	337,000	1,649,000	998,000
Warranty costs incurred	(385,000)	(351,000)	(1,155,000)	(1,088,000)
Adjustment to pre-existing warranties	0	0	0	(290,000)
Balance at end of period	1,878,000	1,466,000	1,878,000	1,466,000
Non-current portion of warranty reserve	777,000	473,000	777,000	473,000	389,000
Current portion of warranty reserve	1,101,000	993,000	1,101,000	993,000	995,000
Instruments [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments (in years)			one to five
Reagent Discs [Member]
Change in accrued warranty reserve [Roll Forward]
Warranty reserve, balance at end of period	642,000		642,000		571,000
Current portion of warranty reserve	$ 642,000		$ 642,000		$ 571,000