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Note 7 - Loan Payable (Tables)
9 Months Ended
Sep. 30, 2018
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]
   
September 30,
2018
   
December 31,
2017
 
Facility B
   
2,500
     
-
 
Facility C
   
3,393
     
5,930
 
Facility D
   
59,148
     
71,823
 
Less: unamortized debt discount and issuance costs
   
(626
)
   
(829
)
Total loan payable
   
64,415
     
76,924
 
Less: loan payable, current portion
   
17,810
     
18,290
 
Loan payable, long-term portion
   
46,605
     
58,634
 
Schedule of Maturities of Long-term Debt [Table Text Block]
Remainder of 2018
   
4,386
 
2019
   
17,900
 
2020
   
17,900
 
2021
   
24,855
 
    $
65,041