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Note 16 - Income Tax (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
2020
  2019
   
 
   
Income tax expense using combined statutory rate of 26.5% (2019 - 26.5%, 2018 - 26.5%)  
$
38,545
 
  $
(53,128
)
Permanent differences  
 
820
 
   
1,566
 
Tax effect of flow through entities  
 
-
 
   
(307
)
Adjustments to tax liabilities for prior periods  
 
882
 
   
(328
)
Non-deductible stock-based compensation  
 
3,081
 
   
2,153
 
Excess tax benefits related to stock-based compensation  
 
-
 
   
(3,672
)
Foreign, state and provincial tax rate differential  
 
(7,463
)
   
(2,402
)
Settlement of long-term incentive arrangement  
 
-
 
   
83,310
 
Other taxes  
 
-
 
   
(45
)
Provision for income taxes as reported  
$
35,865
 
  $
27,147
 
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
    2020   2019
         
Canada   $
19,166
    $
(323,100
)
United States    
126,289
     
122,616
 
Total   $
145,455
    $
(200,484
)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    2020   2019
         
Current                
Canada   $
3,300
    $
369
 
United States    
49,759
     
33,978
 
     
53,059
     
34,347
 
                 
Deferred                
Canada    
1,350
     
(1,620
)
United States    
(18,544
)    
(5,580
)
     
(17,194
)    
(7,200
)
                 
Total   $
35,865
    $
27,147
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    2020   2019
         
Deferred income tax assets                
Loss carry-forwards   $
1,441
    $
2,788
 
Expenses not currently deductible    
39,415
     
23,283
 
Stock-based compensation    
-
     
749
 
Allowance for doubtful accounts    
5,535
     
3,860
 
Inventory and other reserves    
865
     
3,024
 
     
47,256
     
33,704
 
                 
Deferred income tax liabilities                
Depreciation and amortization    
83,676
     
86,072
 
Basis differences of partnerships and other entities    
769
     
793
 
Prepaid and other expenses deducted for tax purposes    
1,505
     
1,276
 
     
85,950
     
88,141
 
                 
Net deferred income tax asset (liability) before valuation allowance    
(38,694
)    
(54,437
)
Valuation allowance    
603
     
965
 
                 
Net deferred income tax asset (liability)   $
(39,297
)   $
(55,402
)
Summary of Operating Loss Carryforwards [Table Text Block]
    Loss carry forward   Gross losses not recognized   Net
    2020   2019   2020   2019   2020   2019
                         
Canada   $
1,364
    $
4,430
    $
-
    $
-
    $
1,364
    $
4,430
 
United States    
13,733
     
18,615
     
11,417
     
15,840
     
2,316
     
2,775