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Note 18 - Income Tax (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
    2019     2018  
             
Combined statutory rate    
26.5
%    
26.5
%
Nondeductible expenses    
3.0
     
2.5
 
Tax effect of flow through entities    
(2.0
)    
(1.4
)
Impact of changes in foreign exchange rates    
(0.1
)    
0.2
 
Adjustments to tax liabilities for prior periods    
(0.1
)    
0.2
 
Effect of changes in enacted tax rate in other jurisdictions    
0.3
     
(0.7
)
Changes in liability for unrecognized tax benefits    
-
     
(0.3
)
Stock-based compensation    
0.3
     
0.9
 
Foreign, state, and provincial tax rate differential    
(1.5
)    
(0.2
)
Change in valuation allowance    
(0.4
)    
(0.1
)
Contingent acquisition consideration    
1.4
     
1.2
 
Other    
0.4
     
0.5
 
Effective income tax rate    
27.8
%    
29.3
%
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
    2019     2018  
             
Canada   $
10,876
    $
21,627
 
United States    
49,884
     
40,097
 
Foreign    
129,838
     
120,110
 
Total   $
190,598
    $
181,834
 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    2019     2018  
             
Current                
Canada   $
2,939
    $
5,134
 
United States    
15,029
     
1,768
 
Foreign    
41,745
     
40,221
 
     
59,713
     
47,123
 
                 
Deferred                
Canada    
238
     
1,689
 
United States    
(520
)    
10,732
 
Foreign    
(6,418
)    
(6,284
)
     
(6,700
)    
6,137
 
                 
Total   $
53,013
    $
53,260
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    2019     2018  
             
Loss carry-forwards and other credits   $
18,969
    $
19,056
 
Expenses not currently deductible    
28,446
     
31,508
 
Revenue not currently taxable    
(6,212
)    
(8,416
)
Stock-based compensation    
386
     
157
 
Investments    
7,870
     
10,628
 
Provision for doubtful accounts    
4,585
     
4,871
 
Financing fees    
(330
)    
(83
)
Net unrealized foreign exchange losses    
68
     
126
 
Depreciation and amortization    
(44,577
)    
(42,257
)
Operating leases    
7,998
     
-
 
Less: valuation allowance    
(7,801
)    
(8,945
)
Net deferred income tax asset   $
9,402
    $
6,645
 
Summary of Operating Loss Carryforwards [Table Text Block]
    Pre-tax loss carry forward     Pre-tax losses not recognized     Pre-tax losses recognized  
    2019     2018     2019     2018     2019     2018  
                                     
Canada   $
16,525
    $
16,249
    $
24
    $
27
    $
16,501
    $
16,222
 
United States    
3,144
     
1,315
     
922
     
921
     
2,222
     
394
 
Foreign    
40,006
     
39,147
     
21,476
     
27,363
     
18,530
     
11,784
 
    Pre-tax loss carry forward     Pre-tax losses not recognized     Pre-tax losses recognized  
    2019     2018     2019     2018     2019     2018  
                                     
Canada   $
1,864
    $
2,208
    $
1,758
    $
1,869
    $
106
    $
339
 
United States    
1,698
     
1,698
     
1,698
     
1,698
     
-
     
-
 
Foreign    
6,271
     
6,285
     
6,271
     
6,285
     
-
     
-
 
Summary of Income Tax Contingencies [Table Text Block]
    2019     2018  
             
Balance, January 1   $
1,460
    $
1,858
 
Gross increases for tax positions of prior periods    
71
     
6
 
Amount recognized on acquisitions    
-
     
289
 
Reduction for lapses in applicable statutes of limitations    
(129
)    
(560
)
Foreign currency translation    
66
     
(133
)
                 
Balance, December 31   $
1,468
    $
1,460