CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (1,275,826)	$ (962,427)	$ (453,477)	$ (4,525,761)
Net loss from discontinued operations	0	0	0	(573,726)
Net loss from continuing operations	(1,275,826)	(962,427)	(453,477)	(3,952,035)
Adjustments to reconcile net loss from continuing operations to net cash (used in) provided by operating activities of continuing operations:
Depreciation and amortization	229,993	214,164	422,018	557,393
Stock-based compensation	235,633	206,086	443,482	959,134
(Recovery of) provision for uncollectible accounts	(4,511)	29,000	28,000	(73,300)
Provision for (recovery of) sales returns	110,390	55,000	122,000	(316,000)
Provision for inventory reserves	0	47,000	598,000	200,000
Provision for accounts receivable discounts	22,802	0	0	0
Gain on insurance claim settlement	0	0	(183,217)	0
Loss on abandonment of property and equipment	0	0	0	117,930
Changes in operating assets and liabilities:
Accounts receivable	1,483,048	718,192	(732,825)	1,447,325
Inventory	(854,921)	(1,149,660)	(3,503,032)	3,998,003
Prepaid expenses and other assets, net	(271,195)	42,044	(36,250)	162,157
Accounts payable	(295,211)	(112,171)	489,014	654,001
Deferred rent	(70,475)	(62,307)	(131,390)	(99,656)
Accrued income taxes	9,534	18,595	27,609	13,480
Accrued expenses and other liabilities	(361,855)	45,948	349,693	(333,731)
Net cash (used in) provided by operating activities of continuing operations	(1,042,594)	(910,536)	(2,560,375)	3,334,701
Net cash used in operating activities of discontinued operations	0	0	0	(1,125,578)
Net cash (used in) provided by operating activities	(1,042,594)	(910,536)	(2,560,375)	2,209,123
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(130,649)	(226,633)	(271,390)	(421,761)
Intangible assets	(27,578)	(993)	(1,501)	(5,615)
Proceeds from sale of long-term assets	0	0	0	250
Net cash used in investing activities of continuing operations	(158,227)	(227,626)	(272,891)	(427,126)
Net cash provided by investing activities of discontinued operations	0	0	0	368,671
Net cash used in investing activities	(158,227)	(227,626)	(272,891)	(58,455)
CASH FLOWS FROM FINANCING ACTIVITIES:
Stock option exercises	0	0	0	2,300
Net cash provided by financing activities of continuing operations	0	0	0	2,300
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(1,200,821)	(1,138,162)	(2,833,266)	2,152,968
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	4,594,007	7,427,273	7,427,273	5,274,305
CASH AND CASH EQUIVALENTS, END OF PERIOD	3,393,186	6,289,111	4,594,007	7,427,273
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	$ 293	$ 92	$ 541	$ 1,737