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Quarterly Financial Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 8,117,000	$ 9,455,000	$ 8,245,000	$ 7,419,000	$ 8,091,000	$ 7,723,000	$ 5,849,000	$ 4,767,000	$ 33,236,000	$ 26,430,000
Gross profit	3,247,000	3,563,000	3,005,000	2,746,000	3,531,000	2,743,000	1,498,000	629,000	12,561,000	8,401,000
Net income (loss)	$ 406,000	$ 645,000	$ 184,000	$ 164,000	$ 635,000	$ 451,000	$ (534,000)	$ (1,191,000)	$ 1,399,000	$ (639,000)
Net income (loss) per share:
Basic	$ .04	$ .05	$ .02	$ .01	$ 0.05	$ 0.04	$ (0.05)	$ (0.10)	$ 0.12	$ (0.06)
Diluted	$ 0.04	$ 0.05	$ 0.02	$ 0.01	$ 0.05	$ 0.04	$ (0.05)	$ (0.10)	$ 0.12	$ (0.06)

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