BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Allowance for doubtful accounts - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts [Abstract]
Balance at beginning of year	$ 113,000	$ 83,000
Additions charged to costs and expenses	255,491	202,420
Accounts written off, net of recoveries	(248,491)	(172,420)
Balance at end of year	$ 120,000	$ 113,000