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Note 6 - Factoring (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31,
    
December 31,
  
   
20
20
    
201
9
  
Accounts receivable - current
   $
134,078
     $
139,785
  
Accounts receivable - non current
    
1,720,000
      
1,720,000
  
     
1,854,078
      
1,859,785
  
                 
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,720,000
)
    
(1,720,000
)
     
(1,733,785
)
    
(1,733,785
)
                 
Accounts receivable, net of allowances for doubtful accounts
   $
120,293
     $
126,000
  
Factoring Fees [Table Text Block]
   
Three Months ended
March 31,
  
   
20
20
    
201
9
  
                 
Factoring fees
   $
32,000
     $
52,797
  
Factored Accounts Receivable [Member]  
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31,
    
December 31,
  
   
20
20
    
201
9
  
                 
Original invoice value
   $
243,170
     $
233,005
  
Factored amount
    
(112,500
)
    
(122,064
)
Balance due from factor
   $
130,670
     $
110,941