SEGMENT REPORTING INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013 Segment		Mar. 31, 2012		Mar. 31, 2011
SEGMENT REPORTING INFORMATION [Abstract]
Minimum percentage of revenues or gross profit (loss) in order for customer group to be identified as reportable segment (in hundredths)									10.00%
Number of reportable segments									2
Segment Reporting Information [Line Items]
Revenues	$ 49,951	$ 49,802	$ 44,258	$ 42,014	$ 42,718	$ 37,850	$ 40,025	$ 36,003	$ 186,025		$ 156,596		$ 143,676
Cost of revenues									87,794		71,493		63,884
Gross profit	26,183	26,076	23,123	22,849	23,381	20,478	22,021	19,223	98,231		85,103		79,792
Medical Market [Member]
Segment Reporting Information [Line Items]
Revenues									31,643	[1]	30,404	[1]	29,146	[1]
Cost of revenues									15,179	[1]	14,323	[1]	14,357	[1]
Gross profit									16,464	[1]	16,081	[1]	14,789	[1]
Veterinary Market [Member]
Segment Reporting Information [Line Items]
Revenues									150,510	[1]	122,253	[1]	109,594	[1]
Cost of revenues									72,477	[1]	57,032	[1]	49,330	[1]
Gross profit									78,033	[1]	65,221	[1]	60,264	[1]
Other Market [Member]
Segment Reporting Information [Line Items]
Revenues									3,872	[1],[2]	3,939	[1],[2]	4,936	[1],[2]
Cost of revenues									138	[1],[2]	138	[1],[2]	197	[1],[2]
Gross profit									$ 3,734	[1],[2]	$ 3,801	[1],[2]	$ 4,739	[1],[2]

[1] Includes certain prior fiscal year amounts by operating segment and unallocated items that were reclassified to conform to the current fiscal year presentation.

[2] Represents unallocated items, not specifically identified to any particular business segment.