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Note T - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
2020
   
2019
 
                 
Accrued compensation
  $
81,000
    $
84,000
 
Accounts receivable allowance
   
474,000
     
474,000
 
Stock-based compensation
   
1,073,000
     
894,000
 
Basis differences in fixed assets
   
(14,000
)
   
(5,000
)
Basis differences in intangible assets
   
65,000
     
62,000
 
Net operating loss and credit carryforwards
   
13,337,000
     
15,002,000
 
Valuation allowances
   
(15,016,000
)
   
(16,511,000
)
                 
    $     $  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
2020
   
2019
 
                 
Federal statutory income tax rate
   
21
%
   
21
%
Permanent differences
   
(9
)
   
(2
)
Effect of net operating loss
   
(12
)
   
(19
)
                 
Effective tax rate
   
%
   
%