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Note 14 - Income Tax (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
    2018     2017  
             
Combined statutory rate    
26.5
%    
26.5
%
Nondeductible expenses    
2.5
     
2.1
 
Tax effect of flow through entities    
(1.4
)    
(1.1
)
Impact of changes in foreign exchange rates    
0.2
     
0.5
 
Adjustments to tax liabilities for prior periods    
0.2
     
0.9
 
Effect of changes in enacted US federal tax rate    
-
     
7.5
 
Effect of changes in enacted tax rate in other jurisdictions    
(0.7
)    
-
 
Changes in liability for unrecognized tax benefits    
(0.3
)    
(0.4
)
Stock-based compensation    
0.9
     
0.6
 
Foreign, state, and provincial tax rate differential    
(0.2
)    
2.6
 
Change in valuation allowance    
(0.1
)    
(0.9
)
Contingent acquisition consideration    
1.2
     
1.0
 
Other    
0.5
     
0.4
 
Effective income tax rate    
29.3
%    
39.7
%
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
    2018     2017  
             
Canada   $
21,627
    $
21,814
 
United States    
40,097
     
33,597
 
Foreign    
120,110
     
100,570
 
Total   $
181,834
    $
155,981
 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    2018     2017  
             
Current                
Canada   $
5,134
    $
4,031
 
United States    
1,768
     
3,235
 
Foreign    
40,221
     
36,310
 
     
47,123
     
43,576
 
                 
Deferred                
Canada    
1,689
     
3,185
 
United States    
10,732
     
20,657
 
Foreign    
(6,284
)    
(5,511
)
     
6,137
     
18,331
 
                 
Total   $
53,260
    $
61,907
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    2018     2017  
             
Loss carry-forwards and other credits   $
19,056
    $
37,869
 
Expenses not currently deductible    
31,508
     
34,265
 
Revenue not currently taxable    
(8,416
)    
(15,227
)
Stock-based compensation    
157
     
525
 
Investments    
10,628
     
11,290
 
Provision for doubtful accounts    
4,871
     
4,221
 
Financing fees    
(83
)    
162
 
Net unrealized foreign exchange losses    
126
     
(634
)
Depreciation and amortization    
(42,257
)    
(32,035
)
Less: valuation allowance    
(8,945
)    
(11,079
)
Net deferred income tax asset   $
6,645
    $
29,357
 
Summary of Operating Loss Carryforwards [Table Text Block]
    Pre-tax loss carry forward     Pre-tax losses not recognized     Pre-tax losses recognized  
    2018     2017     2018     2017     2018     2017  
                                     
Canada   $
16,249
    $
30,904
    $
27
    $
24
    $
16,222
    $
30,880
 
United States    
1,315
     
47,720
     
921
     
915
     
394
     
46,805
 
Foreign    
39,147
     
50,512
     
27,363
     
30,705
     
11,784
     
19,807
 
    Pre-tax loss carry forward     Pre-tax losses not recognized     Pre-tax losses recognized  
    2018     2017     2018     2017     2018     2017  
                                     
Canada   $
2,208
    $
1,881
    $
1,869
    $
1,567
    $
339
    $
314
 
United States    
1,698
     
1,671
     
1,698
     
1,671
     
-
     
-
 
Foreign    
6,285
     
7,139
     
6,285
     
7,139
     
-
     
-
 
Summary of Income Tax Contingencies [Table Text Block]
    2018     2017  
             
             
Balance, January 1   $
1,858
    $
2,292
 
Gross increases for tax positions of prior periods    
6
     
18
 
Amount recognized on acquisitions    
289
     
-
 
Reduction for lapses in applicable statutes of limitations    
(560
)    
(628
)
Foreign currency translation    
(133
)    
176
 
                 
Balance, December 31   $
1,460
    $
1,858