WARRANTY RESERVES (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Instruments [Member]	Jun. 30, 2013 Reagent Discs [Member]	Mar. 31, 2013 Reagent Discs [Member]
Product Warranty Liability [Line Items]
Period of coverage for standard warranty obligation on instruments (in years)			one to three
Change in accrued warranty reserve [Roll Forward]
Balance at beginning of period	$ 1,384,000	$ 1,846,000
Provision for warranty expense	327,000	307,000
Warranty costs incurred	(384,000)	(369,000)
Adjustment to pre-existing warranties	0	(290,000)
Balance at end of period	1,327,000	1,494,000
Non-current portion of warranty reserve	377,000	482,000
Warranty reserve, balance at end of period				529,000	571,000
Current portion of warranty reserve	$ 950,000	$ 1,012,000		$ 529,000	$ 571,000