SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Segment	Jun. 30, 2012
SEGMENT INFORMATION [Abstract]
Number of operating segments			3
Segment information [Abstract]
Net sales	$ 83,296	$ 79,014	$ 167,947	$ 155,217
Earnings before income taxes	16,682	14,824	32,545	28,512
Interest and other income (expense)	66	(1)	64	12
Domestic	57,673	52,875	113,113	103,753
Foreign	25,623	26,139	54,834	51,464
Net sales	83,296	79,014	167,947	155,217
Specialty Products [Member]
Segment information [Abstract]
Net sales	13,219	12,457	25,999	24,714
Earnings before income taxes	5,279	4,849	10,188	9,578
Net sales	13,219	12,457	25,999	24,714
Food, Pharma and Nutrition [Member]
Segment information [Abstract]
Net sales	12,146	11,776	23,154	22,513
Earnings before income taxes	3,269	3,389	5,776	6,098
Net sales	12,146	11,776	23,154	22,513
Animal Nutrition and Health [Member]
Segment information [Abstract]
Net sales	57,931	54,781	118,794	107,990
Earnings before income taxes	8,068	6,587	16,517	12,824
Net sales	$ 57,931	$ 54,781	$ 118,794	$ 107,990