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Quarterly Financial Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 8,091,000	$ 7,723,000	$ 5,849,000	$ 4,767,000	$ 5,748,000	$ 6,469,000	$ 6,617,000	$ 6,078,000	$ 26,430,000	$ 24,912,000
Gross profit	3,531,000	2,743,000	1,498,000	629,000	980,000	2,000,000	2,116,000	1,967,000	8,401,000	7,063,000
Net income (loss)	$ 635,000	$ 451,000	$ (534,000)	$ (1,191,000)	$ (710,000)	$ (167,000)	$ (87,000)	$ (322,000)	$ (639,000)	$ (1,286,000)
Net income (loss) per share:
Basic	$ 0.05	$ 0.04	$ (0.05)	$ (0.10)	$ (0.06)	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.06)	$ (0.11)
Diluted	$ 0.05	$ 0.04	$ (0.05)	$ (0.10)	$ (0.06)	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.06)	$ (0.11)

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