Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net revenues	$ 9,203	$ 10,794	$ 30,950	$ 31,934
Cost of revenues	4,880	5,626	15,863	16,499
Gross margin	4,323	5,168	15,087	15,435
Operating expenses:
Selling expense	1,370	1,462	4,449	4,318
Engineering and product development expense	1,041	894	3,030	2,704
General and administrative expense	1,511	1,528	4,887	4,681
Total operating expenses	3,922	3,884	12,366	11,703
Operating income	401	1,284	2,721	3,732
Other income (expense)	6	(16)	16	1
Earnings before income tax expense	407	1,268	2,737	3,733
Income tax expense	97	431	909	1,253
Net earnings	$ 310	$ 837	$ 1,828	$ 2,480
Net earnings per common share - basic (in dollars per share)	$ 0.03	$ 0.08	$ 0.17	$ 0.24
Weighted average common shares outstanding - basic (in shares)	10,473,928	10,440,803	10,470,410	10,424,001
Net earnings per common share - diluted (in dollars per share)	$ 0.03	$ 0.08	$ 0.17	$ 0.24
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,498,911	10,477,814	10,492,317	10,461,075