INCOME TAXES, Income Tax Effects of Temporary Differences Impacting Deferred Income Tax Assets and Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets [Abstract]
Inventory	$ 468,438	$ 578,029	$ 542,820
Stock-based compensation	51,430	46,165	29,332
Accounts receivable	3,977	0	3,239
Sales returns	119,404	61,251	52,205
Deferred revenue	0	48,878	67,642
Accrued expenses	0	222,538	227,489
FX gain/loss in OCI	359,078	480,112	240,045
Goodwill and other intangible assets amortization	32,670	0	0
Net operating loss	459,196	344,578	337,904
Change in tax method	0	375,595	631,015
Accrued bonuses	0	250,355	363,710
Leases	144,699	0	0
Other	25	0	0
Total deferred income tax assets	1,638,917	2,407,501	2,495,401
Less: valuation allowance	(381,872)	(260,313)	(208,350)
Total deferred income tax assets, net of valuation allowance	1,257,045	2,147,188	2,287,051
Deferred income tax liabilities [Abstract]
Property and equipment depreciation	739,633	897,494	1,004,163
Goodwill and other intangible assets amortization	0	157,401	151,983
Accrued expenses	90,079	0	0
Total deferred income tax liabilities	829,712	1,054,895	1,156,146
Net deferred tax asset (liability)	427,333	1,092,293	1,130,905
Increase in valuation allowance for deferred income tax assets	$ 100,000	$ 100,000	$ 100,000