Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue	$ 12,366	$ 11,573	$ 35,362	$ 33,382
Cost of goods sold	4,921	4,856	14,054	13,464
Gross profit	7,445	6,717	21,308	19,918
Operating expenses:
Sales and marketing	2,220	1,821	6,575	6,209
Research and product development	1,788	1,959	5,497	5,996
General and administrative	1,405	1,470	4,639	4,561
Proceeds from litigation, net	(272)	0	(272)	(250)
Total operating expenses	5,141	5,250	16,439	16,516
Operating income	2,304	1,467	4,869	3,402
Other income (expense), net	85	29	117	40
Income before income taxes	2,389	1,496	4,986	3,442
Provision for income taxes	726	492	1,548	1,310
Net income	1,663	1,004	3,438	2,132
Basic earnings per common share	$ 0.18	$ 0.11	$ 0.38	$ 0.23
Diluted earnings per common share	$ 0.18	$ 0.11	$ 0.36	$ 0.23
Basic weighted average shares outstanding	9,027,764	9,113,713	9,090,903	9,106,455
Diluted weighted average shares outstanding	9,406,941	9,193,574	9,485,808	9,219,161
Unrealized gain (loss) on available-for-sale securities	55	0	(33)	0
Comprehensive income	$ 1,718	$ 1,004	$ 3,405	$ 2,132