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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule Of Allowance For Doubtful Accounts
December 31   2018     2017  
Beginning balance   $ 213,000     $ 141,000  
Bad debt provision     6,000       72,000  
Accounts written-off     (197,000 )     -  
Ending balance   $ 22,000     $ 213,000  
Schedule Of Inventories
December 31   2018     2017  
Raw materials   $ 80,000     $ 68,000  
Work-in-process     12,000       10,000  
Finished goods     261,000       223,000  
    $ 353,000     $ 301,000  
Schedule Of Estimated Useful Lives
Production tooling, machinery and equipment 1 - 6 years
Office furniture and fixtures 3 years
Computer equipment and software 3 - 5 years
Schedule Of Weighted Average Common Shares Outstanding

Year ended December 31

  2018     2017  
Denominator for basic net income (loss) per share - weighted average shares     11,776,000       11,717,000  
Effect of dilutive securities:                
Stock options, restricted stock units and restricted stock awards     231,000       -  
Denominator for diluted net income (loss) per share - weighted average shares     12,007,000       11,717,000