Organization And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Working capital	$ 1,400,000
Inventory write down	$ 0	$ 0
Potentially dilutive common stock equivalents excluded from diluted earnings per share	990,000	1,000,000
Reversal of prior year accrued allowances	$ 341,200	$ 1,180,000
Sales and Marketing Expenses [Member]
Advertising and promotion expense	214,856	254,283
Shipping and handling costs	$ 16,870	$ 25,730