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Note 2 - Revision of Previously Issued Financial Statements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
   
Three Months
Ended
March 31, 2017
 
   
As Reported
   
Adjustment
   
As Re
vised
 
Condensed Consolidated Statement of Operations and Comprehensive Income Information
 
Selling, general and administrative
  $
45,733
    $
523
    $
46,256
 
Depreciation and amortization
   
38,404
     
1,132
     
39,536
 
Total costs and expenses
   
147,074
     
1,655
     
148,729
 
Income from operations
   
60,353
     
(1,655
)    
58,698
 
Income before income taxes
   
53,034
     
(1,655
)    
51,379
 
Income tax provision
   
19,819
     
(629
)    
19,190
 
Net income
   
33,215
     
(1,026
)    
32,189
 
Comprehensive income
  $
33,217
    $
(1,026
)   $
32,191
 
                         
Net income per common share:
                       
Basic
  $
5.86
    $
(0.18
)   $
5.68
 
Diluted
  $
5.80
    $
(0.18
)   $
5.62
 
                         
Condensed Consolidated Statement of
Cash Flows Information
 
Net income
  $
33,215
    $
(1,026
)   $
32,189
 
Depreciation and amortization
   
38,404
     
1,132
     
39,536
 
Accounts receivable, net
   
6,034
     
523
     
6,557
 
Change in deferred income taxes
   
472
     
(629
)    
(157
)
Net cash provided by operating activities
  $
78,260
    $
-
    $
78,260