Consolidated Statement of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net revenues	$ 10,823	$ 9,203	$ 29,955	$ 30,950
Cost of revenues	5,246	4,880	14,982	15,863
Gross margin	5,577	4,323	14,973	15,087
Operating expenses:
Selling expense	1,394	1,370	4,200	4,449
Engineering and product development expense	905	1,041	2,878	3,030
General and administrative expense	1,574	1,511	5,364	4,887
Total operating expenses	3,873	3,922	12,442	12,366
Operating income	1,704	401	2,531	2,721
Other income	17	6	63	16
Earnings before income tax expense	1,721	407	2,594	2,737
Income tax expense	631	97	937	909
Net earnings	$ 1,090	$ 310	$ 1,657	$ 1,828
Net earnings per common share - basic (in dollars per share)	$ 0.11	$ 0.03	$ 0.16	$ 0.17
Weighted average common shares outstanding - basic (in shares)	10,295,447	10,473,928	10,327,095	10,470,410
Net earnings per common share - diluted (in dollars per share)	$ 0.11	$ 0.03	$ 0.16	$ 0.17
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,318,715	10,498,911	10,344,747	10,492,317