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Note 3 - Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
March 31,
 
 
December 31,
 
   
2017
    
2016
  
Accounts receivable - current
   $
576,256
     $
1,577,031
  
Accounts receivable - non current
    
2,070,000
      
2,070,000
  
     
2,646,256
      
3,647,031
  
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,000,000
)
    
(500,000
 )
Accounts receivable, net of allowances for doubtful accounts
   $
1,632,471
     $
3,133,246