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Note 13 - Net Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
March 31,
 
   
2018
   
2017
 
Numerator:
 
 
 
 
 
 
 
 
Net income
  $
40,653
    $
32,113
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
   
5,702,539
     
5,671,838
 
Effect of dilutive equity awards
(1)
   
40,109
     
59,063
 
Weighted average common shares outstanding - diluted
   
5,742,648
     
5,730,901
 
                 
Net income per
common
share:
 
 
 
 
 
 
 
 
Basic
  $
7.13
    $
5.66
 
Diluted
  $
7.08
    $
5.60