Organization And Summary Of Significant Accounting Policies (Schedule Of Product Warranty Liabilities) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Organization And Summary Of Significant Accounting Policies Schedule Of Product Warranty Liabilities
Balance at the beginning of the period	$ 328,279	$ 294,122
Amount accrued	64,060	940,291
Expenditures	181,156	906,134
Balance at period-end	$ 210,183	$ 328,279