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Quarterly Financial Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data
Net sales	$ 7,449,000	$ 7,548,000	$ 6,673,000	$ 6,541,000	$ 6,038,000	$ 7,520,000	$ 6,344,000	$ 6,403,000	$ 28,211,000	$ 26,305,000
Gross profit	3,384,000	3,499,000	2,986,000	2,802,000	2,487,000	3,709,000	2,903,000	2,683,000	12,671,000	11,782,000
Net income (loss)	$ 627,000	$ 561,000	$ 250,000	$ 96,000	$ (398,000)	$ 424,000	$ 70,000	$ 115,000	$ 1,534,000	$ 211,000
Net income (loss) per share:
Basic	$ 0.05	$ 0.05	$ 0.02	$ 0.01	$ (0.03)	$ 0.03	$ 0.01	$ 0.01	$ 0.13	$ 0.02
Diluted	$ 0.05	$ 0.05	$ 0.02	$ 0.01	$ (0.03)	$ 0.03	$ 0.01	$ 0.01	$ 0.13	$ 0.02

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