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Note 14 - Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]
   
2017
    
2016
    
2015
  
                         
Matching contribution
   $
1,663,198
     $
1,365,111
     $
1,314,276
  
    $
1,663,198
     $
1,365,111
     $
1,314,276
  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
2017
    
2016
    
2015
  
                         
Balance, beginning
   $
10,455,183
     $
8,875,025
     $
7,503,692
  
Employee deferrals
    
932,921
      
794,168
      
693,656
  
Company match and interest
    
1,024,933
      
848,831
      
726,001
  
Cash payments made
    
(66,102
 )    
(62,841
 )    
(48,324
 )
Balance, ending
   $
12,346,935
     $
10,455,183
     $
8,875,025