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Note 18 - Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Carrying value at     Fair value measurements  
    December 31, 2018     Level 1     Level 2     Level 3  
                         
Assets                                
Interest rate swap asset   $
926
    $
-
    $
926
    $
-
 
Investments                                
Equity securities and funds   $
2,835
    $
2,835
    $
-
    $
-
 
Fixed income and bond funds   $
4,101
    $
185
    $
3,916
    $
-
 
                                 
                                 
Liabilities                                
Contingent consideration liability   $
93,865
    $
-
    $
-
    $
93,865
 
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
    2018     2017  
Balance, January 1   $
50,300
    $
32,266
 
Amounts recognized on acquisitions    
61,525
     
21,477
 
Fair value adjustments (note 4)    
1,675
     
1,054
 
Resolved and settled in cash    
(18,757
)    
(6,169
)
Other    
(877
)    
1,672
 
Balance, December 31   $
93,865
    $
50,300
 
                 
Less: current portion   $
17,122
    $
18,657
 
Non-current portion   $
76,743
    $
31,643
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
    2018     2017  
    Carrying
amount
    Fair
value
    Carrying
amount
    Fair
value
 
                         
Other receivables   $
12,088
    $
12,088
    $
10,136
    $
10,136
 
Advisor loans receivable (non-current)    
46,661
     
46,661
     
44,978
     
44,978
 
Long-term debt (non-current)    
670,289
     
670,289
     
247,467
     
247,467