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Note 12 - Income Tax (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
    2016   2015
         
Income tax expense using combined statutory rate of 26.5% (2015 - 26.5%, 2014 - 26.5%)   $
21,632
    $
16,326
 
Permanent differences    
434
     
488
 
Tax effect of flow through entities    
(243
)    
(230
)
Impact of changes in foreign exchange rates    
-
     
(10
)
Adjustments to tax liabilities for prior periods    
(456
)    
1,393
 
Effects of changes in enacted tax rates    
-
     
(42
)
Changes in liability for unrecognized tax benefits    
(156
)    
(130
)
Foreign, state and provincial tax rate differential    
5,699
     
3,750
 
Gain on disposition of preferred shares    
-
     
1,246
 
Other taxes    
477
     
(161
)
Change in valuation allowances    
-
     
782
 
Provision for income taxes as reported   $
27,387
    $
23,412
 
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
    2016   2015
         
Canada   $
16,989
    $
8,590
 
United States    
64,641
     
53,020
 
Total   $
81,630
    $
61,610
 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    2016   2015
         
Current                
Canada   $
3,689
    $
829
 
United States    
21,945
     
10,757
 
     
25,634
     
11,586
 
                 
Deferred                
Canada    
(317
)    
1,352
 
United States    
2,070
     
10,474
 
     
1,753
     
11,826
 
                 
Total   $
27,387
    $
23,412
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    2016   2015
         
Deferred income tax assets                
Loss carry-forwards   $
1,066
    $
6,071
 
Expenses not currently deductible    
18,120
     
13,245
 
Stock-based compensation    
2,956
     
2,420
 
Basis differences of partnerships and other entities    
1,047
     
925
 
Allowance for doubtful accounts    
3,457
     
2,967
 
Inventory and other reserves    
542
     
548
 
     
27,188
     
26,176
 
                 
Deferred income tax liabilities                
Depreciation and amortization    
31,168
     
13,971
 
Prepaid and other expenses deducted for tax purposes    
1,942
     
1,782
 
     
33,110
     
15,753
 
                 
Net deferred income tax asset (liability) before valuation allowance    
(5,922
)    
10,423
 
Valuation allowance    
756
     
783
 
                 
Net deferred income tax asset (liability)   $
(6,678
)   $
9,640
 
Summary of Operating Loss Carryforwards [Table Text Block]
    Loss carry forward   Gross losses not recognized   Net
    2016   2015   2016   2015   2016   2015
                         
Canada   $
2,082
    $
3,234
    $
-
    $
-
    $
2,082
    $
3,234
 
United States    
7,902
     
21,472
     
6,470
     
6,470
     
1,432
     
15,002
 
Summary of Income Tax Contingencies [Table Text Block]
Balance, December 31, 2014   $
494
 
Reduction for lapses in applicable statutes of limitations    
(202
)
Balance, December 31, 2015    
292
 
Increases based on tax positions related to 2016    
(144
)
Balance, December 31, 2016   $
148