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Note 7 - Loan Payable (Tables)
 3 Months Ended
Mar. 31, 2019
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]
   
March 31, 2019
    
December 31, 2018
  
Facility A
   $
1,000
     $
1,000
  
Facility B
    
5,786
      
6,000
  
Facility C
    
36,012
      
3,232
  
Facility D
    
50,699
      
54,924
  
Less: unamortized debt discount and issuance costs
    
(683
 )    
(555
 )
Total loan payable
   $
92,814
     $
64,601
  
Less: loan payable, current portion
    
(24,788
 )    
(18,400
 )
Loan payable, long-term portion
   $
68,026
     $
46,201
  
Schedule of Maturities of Long-term Debt [Table Text Block]
Remainder of 2019
    
18,591
  
2020
    
24,788
  
2021
    
50,118
  
     
93,497