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Note 6 - Factoring (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31,
    
December 31,
  
   
201
8
    
201
7
  
Accounts receivable - current
   $
318,961
     $
2,889,731
  
Accounts receivable - non current
    
1,740,000
      
1,760,000
  
     
2,058,961
      
4,649,731
  
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,000,000
)
    
(1,000,000
)
     
(1,013,785
)
    
(1,013,785
)
Accounts receivable, net of allowances for doubtful accounts
   $
1,045,176
     $
3,635,946
  
Factoring Fees [Table Text Block]
   
Three Months ended
March 31,
  
   
201
8
    
201
7
  
                 
Factoring fees
   $
91,523
     $
48,391
  
Factored Accounts Receivable [Member]  
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31,
    
December 31,
  
   
201
8
    
201
7
  
                 
Original invoice value
   $
216,178
     $
423,349
  
Factored amount
    
(162,133
)
    
(313,484
)
Balance due from factor
   $
54,045
     $
109,865