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Organization And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Dec. 22, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Potentially dilutive common stock equivalents excluded from diluted earnings per share				783,335	1,516,670
Accrued sales allowances recovered				$ 1,749	$ 47,741
Changes in income tax rate description	On December 22, 2017, President Trump signed into law the legislation generally known as Tax Cut and Jobs Act of 2017. The tax law includes significant changes to the U.S. corporate tax systems including a rate reduction from 35% to 21% beginning in January of 2018, a change in the treatment of foreign earnings going forward and a deemed repatriation transition tax.
Accounts Payable And Accrued Liabilities [Member]
Accrual of credits on account of pontential warranty claims and various other expenses		$ 324,225		324,225		$ 600,622
Sales and Marketing Expenses [Member]
Advertising and promotion expense		72,732	$ 92,584	77,650	113,247
Shipping and handling costs		$ 7,505	$ 29,866	$ 33,856	$ 46,786