INCOME TAXES (Schedule of components of temporary differences of deferred tax asset, net) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accrued expenses	$ 20,000	$ 27,000
Allowance for doubtful accounts	1,000	1,000
Deferred revenue		7,000
Reserve for obsolescence	29,000	25,000
Expense associated with non-qualified stock options	44,000	94,000
Revenue Sharing Agreement	276,000	200,000
General business credit	1,198,000	1,378,000
NOL carryforward	8,893,000	11,377,000
Deferred tax assets, gross	10,461,000	13,109,000
Less: valuation allowance	(10,461,000)	(13,109,000)	$ (12,825,000)
Deferred tax asset, net