Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss	$ 416,000	$ 218,000
Liabilities and reserves	25,000	116,000
Property and equipment and inventory	6,000	9,000
Stock options	85,000	75,000
Deferred tax assets, net	532,000	418,000
Deferred tax liabilities:
Defective warranty allowance		29,000
Gain/loss on disposal	9,000	8,000
Intangible assets	433,000	393,000
Valuation allowance	90,000
Deferred tax liabilities, net	532,000	430,000
Net deferred tax assets and liabilities		$ (12,000)