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Note 3 - Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
June 30,
 
 
December 31,
 
 
 
2017
 
 
2016
 
                 
Accounts receivable - current
   $
861,674
     $
1,577,031
  
Accounts receivable - non current
    
2,070,000
      
2,070,000
  
     
2,931,674
      
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 allowance for doubtful accounts
   $
1,917,889
     $
3,133,246