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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Schedule Of Deferred Tax Assets [Table Text Block]
The tax effects of temporary differences that give rise to significant portions of the deferred tax assets at December 31, 2012 and 2011 are presented below.
2012 2011
Deferred tax assets:            
       Depreciation $ 95,000 $ 91,000
       Allowance for bad debts 37,000 37,000
       Net operating loss carryforwards 22,525,000 22,516,000
       Stock option expense 1,051,000 1,051,000
       Research and other credits 977,000 1,008,000
       Other temporary differences 15,000 15,000
              Total gross deferred tax assets 24,700,000 24,718,000
       Less valuation allowance      (24,700,000 )      (24,718,000 )
$ -- $ --