Summary Consolidated Statements Of Operations And Comprehensive Income (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Preservation services	$ 16,399,000	$ 14,656,000	$ 48,371,000	$ 45,018,000
Products	16,893,000	14,923,000	50,043,000	43,932,000
Other	137,000	75,000	504,000	279,000
Total revenues	33,429,000	29,654,000	98,918,000	89,229,000
Cost of preservation services and products:
Preservation services	9,005,000	8,349,000	26,645,000	25,709,000
Products	3,114,000	2,393,000	8,300,000	7,051,000
Total cost of preservation services and products	12,119,000	10,742,000	34,945,000	32,760,000
Gross margin	21,310,000	18,912,000	63,973,000	56,469,000
Operating expenses:
General, administrative, and marketing	16,533,000	14,726,000	48,374,000	42,676,000
Research and development	1,829,000	1,690,000	5,192,000	5,099,000
Total operating expenses	18,362,000	16,416,000	53,566,000	47,775,000
Operating income	2,948,000	2,496,000	10,407,000	8,694,000
Interest expense	42,000	49,000	159,000	116,000
Interest income	(1,000)	(1,000)	(4,000)	(13,000)
Other expense (income), net	283,000	159,000	442,000	(12,000)
Income before income taxes	2,624,000	2,289,000	9,810,000	8,603,000
Income tax expense	1,086,000	270,000	3,947,000	3,098,000
Net income	1,538,000	2,019,000	5,863,000	5,505,000
Income per common share:
Basic	$ 0.06	$ 0.07	$ 0.21	$ 0.20
Diluted	$ 0.06	$ 0.07	$ 0.21	$ 0.19
Dividends declared per share	$ 0.025		$ 0.025
Weighted-average common shares outstanding:
Basic	26,810	27,523	26,951	27,431
Diluted	27,210	27,850	27,329	27,765
Net income	1,538,000	2,019,000	5,863,000	5,505,000
Other comprehensive income (loss)	20,000	(5,000)	28,000	5,000
Comprehensive income	$ 1,558,000	$ 2,014,000	$ 5,891,000	$ 5,510,000