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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2016
Income Taxes Tables  
Provision for income tax
    2016     2015     2014  
Current                  
   Federal   $ -     $ -     $ -  
   State     -       4,527       -  
Deferred (net of valuation allowance)                        
   Federal     -       -       -  
   State     -       -       -  
Income tax provision   $ -     $ 4,527     $ -  
                         
Reconciliation of income tax expense (benefit)
    2016     2015     2014  
                   
Federal income tax expense at statutory rate     (34.0 )%     (34.0 )%     (34.0 )%
State income tax, net of federal benefit     (5.3 )%     (5.1 )%     (5.3 )%
Permanent differences     8.4 %     5.7 %     2.7 %
Change in tax rates     (0.3 )%     0.7 %     (6.1 )%
Expirations of state net operating losses     1.8 %     17.4 %     0.0 %
Change in stock options and restricted stock     11.8 %     0.0 %     0.0 %
Change in valuation allowance     16.4 %     13.7 %     42.8 %
Other     1.2 %     1.8 %     (0.1 )%
Effective tax rate     0.0 %     0.2 %     0.0 %
                         
Deferred income tax assets and liabilities
    2016     2015  
Deferred tax assets:            
Net operating loss carryforward   $ 11,023,000     $ 10,860,000  
Capital loss carryforward     811,000       808,000  
Stock options and restricted stock     2,694,000       3,048,000  
Inventory reserve     195,000       249,000  
Allowance for doubtful accounts     425,000       144,000  
Accrued expenses     487,000       277,000  
Deferred revenue     13,000       -  
Intangibles     29,000       23,000  
Deferred rent     252,000       54,000  
      15,929,000       15,463,000  
Less valuation allowance     (15,530,000 )     (15,050,000 )
      399,000       413,000  
                 
Deferred tax liabilities:                
Leasehold improvements and equipment     (282,000 )     (284,000 )
Prepaid expenses     (117,000 )     (129,000 )
      (399,000 )     (413,000 )
                 
    $ -     $ -