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Note 9 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Three Months Ended March 31,
 
   
2019
   
2018
 
Current:
               
Federal
  $
---
    $
240,924
 
State
   
3,000
     
9,000
 
Total current provision
   
3,000
     
249,924
 
Deferred:
               
Federal
  $
(459,000
)   $
(2,154
)
State
   
------
     
----
 
Total deferred (benefit) provision
   
(459,000
)    
(2,154
)
Income tax expense (benefit) provision
  $
(456,000
)   $
247,770
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2019
   
2018
 
Income tax provision at federal statutory rate (21%)
  $
(552,918
)   $
169,296
 
Foreign tax loss
   
16,673
     
9,855
 
State taxes
   
3,000
     
9,000
 
Difference between tax and book depreciation
   
24,072
     
33,037
 
Stock compensation
   
25,002
     
44,860
 
Other Permanent differences
   
28,171
     
(18,278
)
Income tax (benefit) expense
  $
(456,000
)   $
247,770