Organization And Summary Of Significant Accounting Policies (Schedule Of Product Warranty Liabilities) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 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	41,871	940,291
Amount expensed	175,765	906,134
Balance at period-end	$ 194,385	$ 328,279