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Note 7 - Loan Payable (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Standby Fees Based on Total Funded Debt to EBITDA Ratio [Table Text Block]
   
If Total Funded Debt to EBITDA is:
  
       
Availment type or fee
  
Less than 1.00
    
Greater than or
equal to 1.00 and
less than 2.00
    
Greater than or
equal to 2.00 and
less than 2.25
    
Greater than
or equal to
2.25
  
Canadian dollar borrowings based on Bankers
’ Acceptance or U.S. dollar borrowings based on LIBOR (Margin)
    
2.00
 %    
2.25
 %    
2.75
 %    
3.25
 %
                                 
Canadian or U.S. dollar borrowings based on Prime Rate or U.S. dollar borrowings based on Base Rate (Margin)
    
0.75
 %    
1.00
 %    
1.50
 %    
2.00
 %
                                 
Standby fees
    
0.40
 %    
0.45
 %    
0.55
 %    
0.65
 %
Schedule of Debt [Table Text Block]
   
June 30, 2017
    
December 31,
2016
  
                 
Facility B
   $
-
     $
6,000,000
  
Facility C
    
6,625,465
      
4,731,306
  
Facility D
    
80,273,100
      
-
  
Less: unamortized debt discount and issuance costs
    
(938,939
 )    
(482,498
 )
Total loan payable
    
85,959,626
      
10,248,808
  
Less: loan payable, current portion
    
18,289,853
      
2,233,110
  
Loan payable, long-term portion
   $
67,669,773
     $
8,015,698
  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal repayments
        
Remainder of 2017
   $
9,144,926
  
2018
    
18,289,853
  
2019
    
18,289,853
  
2020
    
18,103,004
  
2021
    
17,542,457
  
Thereafter
    
5,528,472
  
    $
86,898,565