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Note 8 - Loan Payable (Tables)
 6 Months Ended
Jun. 30, 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 2.50
    
Greater than or equal to
2.50
  
                                 
Canadian dollar borrowings based on Canadian Dollar Offered Rate or U.S. dollar borrowings based on LIBOR (Margin)
    
1.50%
      
1.85%
      
2.35%
      
2.85%
  
                                 
Canadian borrowings based on Prime Rate or Canadian or U.S. dollar borrowings based on Base Rate (Margin)
    
0.25%
      
0.60%
      
1.10%
      
1.60%
  
                                 
Standby fees
    
0.30%
      
0.37%
      
0.47%
      
0.57%
  
Schedule of Debt [Table Text Block]
   
June 30, 2019
    
December 31, 2018
  
Revolver
    
100,927
      
 
  
Facility A
   $
-
     $
1,000
  
Facility B
    
-
      
6,000
  
Facility C
    
-
      
3,232
  
Facility D
    
-
      
54,924
  
Less: unamortized debt discount and issuance costs
    
(1,026
 )    
(555
 )
Total loan payable
   $
99,901
     $
64,601
  
Less: loan payable, current portion
    
-
      
(18,400
 )
Loan payable, long-term portion
   $
99,901
     $
46,201
  
Schedule of Maturities of Long-term Debt [Table Text Block]
Remainder of 2019
   $
-
  
2020
    
-
  
2021
    
-
  
2022
    
-
  
2023
    
100,927
  
    $
100,927