INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carry-forward	$ 11,526,599	$ 9,917,641	$ 11,626,143
Accounts receivable reserve	0	0	3,499
Inventory	21,000	48,011	96,934
Stock-based compensation	813,585	388,925	282,850
Start-up expenditures	242,704	279,709	477,917
Research and development credit carryforward	326,269	232,198	0
Loss on equity investment	760	11,760	139,676
Accrued bonus	100,896	0	0
Severance liability	0	0	69,860
Other	19,605	4,272	21,423
Total deferred tax assets	13,051,418	10,882,516	12,718,302
Deferred tax liabilities:
Machinery and equipment	(214,587)	(220,888)	(316,232)
Patents and trademarks	(562,140)	(558,760)	(807,137)
Gain on investment	(612,286)	0	0
Accrued expense	(70,933)	0	0
Other intangible assets	(153,307)	(124,953)	(138,713)
Total deferred tax liabilities	(1,613,253)	(904,601)	(1,262,082)
Valuation allowance	(11,438,165)	(9,977,915)	(11,456,220)
Net deferred taxes	$ 0	$ 0	$ 0