Summary Consolidated Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Products	$ 20,350	$ 18,195	$ 39,805	$ 37,991
Preservation services	14,340	15,317	30,616	30,994
Other		8		71
Total revenues	34,690	33,520	70,421	69,056
Cost of products and preservation services:
Products	4,131	3,721	7,932	7,186
Preservation services	8,175	8,320	17,632	17,115
Total cost of products and preservation services	12,306	12,041	25,564	24,301
Gross margin	22,384	21,479	44,857	44,755
Operating expenses:
General, administrative, and marketing	17,959	16,932	36,234	34,909
Research and development	2,203	1,736	4,705	3,724
Total operating expenses	20,162	18,668	40,939	38,633
Operating income	2,222	2,811	3,918	6,122
Interest expense	(16)	54	45	104
Interest income	(45)		(48)	(2)
Other (income) expense, net	(111)	22	(210)	241
Income before income taxes	2,394	2,735	4,131	5,779
Income tax expense	233	950	911	1,802
Net income	2,161	1,785	3,220	3,977
Income per common share:
Basic	$ 0.08	$ 0.06	$ 0.12	$ 0.14
Diluted	$ 0.08	$ 0.06	$ 0.11	$ 0.14
Dividends declared per common share	$ 0.0300	$ 0.0275	$ 0.0575	$ 0.0525
Weighted-average common shares outstanding:
Basic	27,502	26,856	27,439	26,858
Diluted	28,317	27,369	28,382	27,456
Net income	2,161	1,785	3,220	3,977
Other comprehensive income	41	54	6	21
Comprehensive income	$ 2,202	$ 1,839	$ 3,226	$ 3,998