Organization And Summary Of Significant Accounting Policies (Schedule Of Changes In Reserve) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Organization And Summary Of Significant Accounting Policies Schedule Of Changes In Reserve
Balance at beginning of the period	$ 364,894	$ 194,061
Accrued allowances	89,666	191,468
Reversal of prior year accrued allowances		1,749
Expenditures	191,468	18,886
Balance at period-end	$ 263,092	$ 364,894