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Note 9 - Income Taxes (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Six Months Ended June 30,
 
   
2019
   
2018
 
Current:
               
Federal
  $
---
    $
48,330
 
State
   
7,303
     
3,500
 
Total current provision
   
7,303
     
51,830
 
Deferred:
               
Federal
  $
(698,000
)   $
56,888
 
State
   
------
     
----
 
Total deferred (benefit) provision
   
(698,000
)    
56,888
 
Income tax expense (benefit) provision
  $
(690,697
)   $
108,718
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Six Months Ended
 
   
June 30,
 
   
2019
   
2018
 
Income tax provision at federal statutory rate (21%)
  $
(895,428
)   $
(139,314
)
Foreign tax loss
   
28,175
     
82,715
 
State taxes
   
3,000
     
3,500
 
Difference between tax and book depreciation
   
48,144
     
39,827
 
Stock compensation
   
62,505
     
140,052
 
Other Permanent differences
   
62,907
     
(18,062
)
Income tax (benefit) expense
  $
(690,697
)   $
108,718