ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Product Warranty Liabilities) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance at the beginning of the period	$ 56,465	$ 247,850
Amount accrued	627	46,322
Payments and credits	(2,849)	(237,707)
Balance at end of the period	$ 54,243	$ 56,465