CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue
Product sales	$ 80,008	$ 80,454	$ 80,683
License and fee income	2,551	2,276	1,501
Revenue, Total	82,559	82,730	82,184
Cost of sales	52,017	50,073	49,155
Gross profit	30,542	32,657	33,029
Operating expenses
Selling, general and administrative	22,258	22,685	24,013
Amortization of purchased intangibles	3,374	2,793	3,077
Research and development	1,133	1,649	1,942
Loss on disposal of equipment	10	34	111
Operating expenses, Total	26,775	27,161	29,143
Earnings from operations	3,767	5,496	3,886
Other income (expense)
Interest income	127	162	99
Interest expense	(629)	(697)	(976)
Other, net	9	5	294
Other income (expense), Total	(493)	(530)	(583)
Earnings before income taxes	3,274	4,966	3,303
Income tax expense	1,135	1,902	1,233
NET EARNINGS	2,139	3,064	2,070
NET EARNINGS PER SHARE
Basic (in dollars per share)	$ 0.07	$ 0.09	$ 0.06
Diluted (in dollars per share)	$ 0.07	$ 0.09	$ 0.06
WEIGHTED AVERAGE SHARES
Basic (in shares)	31,458	33,414	33,259
Diluted (in shares)	32,173	33,820	33,485
COMPREHENSIVE EARNINGS
Net earnings	2,139	3,064	2,070
Other comprehensive earnings (loss), net of taxes
Reclassification adjustment for (gain) loss included in net earnings	(8)	(2)	1
Unrealized gain (loss) on securities arising during the year	45	(26)	11
Total other comprehensive earnings (loss)	37	(28)	12
Total comprehensive earnings	$ 2,176	$ 3,036	$ 2,082