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Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail) - 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	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 16,561,520	$ 15,786,913	$ 14,971,681	$ 13,305,098	$ 12,807,175	$ 12,448,436	$ 13,013,143	$ 11,252,417	$ 60,625,212	$ 49,521,171	$ 43,433,867
Gross Profit	6,850,134	6,865,342	6,601,521	6,194,171	5,888,332	6,003,892	6,121,524	5,288,458	26,511,168	23,302,206	19,277,075
Total operating expenses	5,730,406	6,558,122	10,250,807	7,357,840	5,418,089	5,803,260	6,248,678	4,862,979	29,897,174	22,333,006	15,824,908
Net income (loss)	$ 1,274,559	$ 437,259	$ (3,190,347)	$ (1,105,791)	$ 591,933	$ 234,353	$ (70,121)	$ 385,090	$ (2,584,320)	$ 1,141,255	$ 3,733,707
Basic net income (loss) per share	$ 0.13	$ 0.05	$ (0.34)	$ (0.12)	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ (0.27)	$ 0.12	$ 0.65
Diluted net income (loss) per share	$ 0.13	$ 0.04	$ (0.34)	$ (0.12)	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ (0.27)	$ 0.11	$ 0.40

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