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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Schedule Of Inventories
    September 30,     December 31,  
    2018     2017  
Raw materials   $ 90,000     $ 68,000  
Work-in-process     3,000       10,000  
Finished goods     230,000       223,000  
    $ 323,000     $ 301,000  
Schedule of Property and Equipment
    September 30,     December 31,  
    2018     2017  
Property and Equipment:            
Production tooling, machinery and equipment   $ 4,087,000     $ 4,003,000  
Office furniture and fixtures     329,000       325,000  
Computer equipment and software     2,726,000       2,680,000  
Leasehold improvements     577,000       577,000  
Construction in-progress     995,000       206,000  
      8,714,000       7,791,000  
Accumulated depreciation and amortization     ( 5,665,000 )     ( 5,121,000 )
Net Property and Equipment   $ 3,049,000     $ 2,670,000  
Schedule Of Weighted Average Common Shares Outstanding
    Three Months Ended     Nine Months Ended  
    September 30     September 30  
    2018     2017     2018     2017  

Denominator for basic net income (loss) per share -

  weighted average shares

     11,729,000       11,758,000       11,784,000       11,698,000  
Effect of dilutive securities:                                
Stock options and restricted stock units and awards     283,000       19,000       242,000       —  

Denominator for diluted net income (loss) per share -

  weighted average shares

     12,012,000       11,777,000       12,026,000       11,698,000