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Note 7 - Factoring (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 30,
    
December 31,
  
   
20
20
    
2019
  
                 
Accounts receivable - current
   $
506,165
     $
139,785
  
Accounts receivable - non current
    
1,720,000
      
1,720,000
  
Total accounts receivable
    
2,226,165
      
1,859,785
  
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,720,000
)
    
(1,720,000
)
Total allowance for doubtful accounts
    
(1,733,785
)
    
(1,733,785
)
Accounts receivable, net of allowance for doubtful accounts
   $
492,380
     $
126,000
  
Factoring Fees [Table Text Block]
 
 
Three Months ended
September 30,
 
 
Nine Months ended
September 30,
 
 
 
20
20
 
 
2019
 
 
2020
 
 
2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Factoring fees
 
$
15,934
 
 
$
32,891
 
 
$
81,164
 
 
$
125,231
 
Factored Accounts Receivable [Member]  
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 30,
    
December 31,
  
   
20
20
    
2019
  
                 
Original invoice value
   $
128,004
     $
233,005
  
Factored amount
    
(64,742
)
    
(122,064
)
Balance due from factor
   $
63,262
     $
110,941