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Note 13 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Current provision −

                       

Federal

  $ 20,303     $ 31,819     $ 22,443  

State

    4,648       6,291       4,030  
      24,951       38,110       26,473  

Deferred provision −

                       

Federal

    20,925       6,082       (64,821 )

State

    2,064       (85 )     2,618  
      22,989       5,997       (62,203 )

Provision (benefit) for income taxes

  $ 47,940     $ 44,107     $ (35,730 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Income taxes at the federal statutory rate

  $ 39,530     $ 38,469     $ 47,749  

State income taxes, net of federal benefit

    5,303       4,913       3,246  

Tax effect of permanent differences

    1,562       596       (4,097 )

Revaluation of deferred taxes

                (82,862 )

Other, net

    1,545       129       234  

Provision (benefit) for income taxes

  $ 47,940     $ 44,107     $ (35,730 )
Schedule of Income Taxes Related to Other Comprehensive Income [Table Text Block]
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Income tax expense related to components of other comprehensive income:

                       

Change in fair value of available-for-sale securities

                183  

Total

  $     $     $ 183  
                         

Paid in capital – stock based compensation

  $     $     $  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   

December 31,

 
   

2019

   

2018

 

Deferred income tax (assets) liabilities:

               

Inventory

  $ (5,086 )   $ (4,076 )

Accounts receivable

    (140 )     (231 )

Finance lease obligations

    (21,618 )     (16,202 )

Finance and operating leases

    (12,726 )      

Stock options

    (8,749 )     (9,026 )

Accrued liabilities

    (2,989 )     (2,481 )

State net operating loss carry forward

    (2,381 )     (2,463 )

State tax credit

    (196 )     (312 )

Other

    (3,817 )     (3,276 )

Difference between book and tax basis- Operating lease assets

    12,628        

Difference between book and tax basis- Depreciation and amortization

    209,250       179,325  
      164,176       141,258  

Valuation allowance

    121       50  

Net deferred income tax liability

  $ 164,297     $ 141,308  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
   

2019

   

2018

   

2017

 

Unrecognized tax benefits at beginning of period

  $ 2,389     $ 2,555     $ 2,401  

Gross increases – tax positions in current year

    1,188       504       619  

Reductions due to lapse of statute of limitations

    (570 )     (670 )     (465 )

Unrecognized tax benefits at end of period

  $ 3,007     $ 2,389     $ 2,555