Consolidated Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues:
Products	$ 81,883		$ 76,194		$ 67,496
Preservation services	62,758		64,498		63,603
Other			71		619
Total revenues	144,641		140,763		131,718
Cost of products and preservation services:
Products	17,167		15,147		11,380
Preservation services	36,183		35,230		35,320
Total cost of products and preservation services	53,350		50,377		46,700
Gross margin	91,291		90,386		85,018
Operating expenses:
General, administrative, and marketing	73,754		68,112		65,149
Research and development	8,699		8,454		7,257
Total operating expenses	82,453		76,566		72,406
Operating income	8,838		13,820		12,612
Interest expense	175		71		179
Interest income	(50)		(4)		(6)
Gain on sale of Medafor investment	(530)		(12,742)
Other than temporary investment impairment			3,229		340
Other expense (income), net	540		(26)		47
Income before income taxes	8,703		23,292		12,052
Income tax expense	1,381		7,120		4,106
Net income	7,322		16,172		7,946
Income per common share:
Basic	$ 0.26		$ 0.59		$ 0.29
Diluted	$ 0.25		$ 0.57		$ 0.28
Dividends declared per common share	$ 0.118		$ 0.108		$ 0.050
Weighted-average common shares outstanding:
Basic	27,379		26,885		26,967
Diluted	28,313	[1]	27,698	[1]	27,411	[1]
Other comprehensive (loss) income	(128)		46		(33)
Comprehensive income	$ 7,194		$ 16,218		$ 7,913

[1] The Company excluded stock options from the calculation of diluted weighted-average common shares outstanding if the per share value, including the sum of (i) the exercise price of the options and (ii) the amount of the compensation cost attributed to future services and not yet recognized, was greater than the average market price of the shares, because the inclusion of these stock options would be antidilutive to income per common share. Accordingly, stock options to purchase 335,000, 656,000, and 1.7 million, shares for the years ended December 31, 2014, 2013, and 2012, respectively, were excluded from the calculation of diluted weighted-average common shares outstanding.