Summary Consolidated Statements Of Operations And Comprehensive Income (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Products	$ 19,796,000	$ 16,454,000
Preservation services	15,677,000	15,659,000
Other	63,000	188,000
Total revenues	35,536,000	32,301,000
Cost of products and preservation services:
Products	3,465,000	2,513,000
Preservation services	8,795,000	8,496,000
Total cost of products and preservation services	12,260,000	11,009,000
Gross margin	23,276,000	21,292,000
Operating expenses:
General, administrative, and marketing	17,977,000	17,970,000
Research and development	1,988,000	1,693,000
Total operating expenses	19,965,000	19,663,000
Operating income	3,311,000	1,629,000
Interest expense	50,000	65,000
Interest income	(2,000)	(2,000)
Other expense (income), net	219,000	(15,000)
Income before income taxes	3,044,000	1,581,000
Income tax expense	852,000	590,000
Net income	2,192,000	991,000
Income per common share:
Basic	$ 0.08	$ 0.04
Diluted	$ 0.08	$ 0.04
Dividends declared per share	$ 0.025
Weighted-average common shares outstanding:
Basic	26,861	27,180
Diluted	27,488	27,530
Net income	2,192,000	991,000
Other comprehensive (loss) income	(33,000)	2,000
Comprehensive income	$ 2,159,000	$ 993,000