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Note 8 - Loan Payable (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Debt [Table Text Block]
   
December 31, 2016
    
December 31, 2015
  
                 
2012 Demand Loan Facilities
   $
-
     $
3,500,000
  
2016 Credit Facility B
    
6,000,000
      
-
  
2016 Credit Facility C
    
4,731,306
      
-
  
Less: unamortized debt discount and issuance costs
    
(482,498
 )    
-
  
Total loan payable
    
10,248,808
      
3,500,000
  
Less: loan payable, current portion
    
2,233,110
      
3,500,000
  
Loan payable, long-term portion
   $
8,015,698
     $
-
  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal repayments as of December 31,
        
2017
   $
2,233,110
  
2018
    
2,233,110
  
2019
    
2,233,110
  
2020
    
2,046,261
  
2021
    
1,485,714
  
Thereafter
    
500,000
  
    $
10,731,305