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Note 12 - Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2012
Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]
   
2012
   
2011
   
2010
 
                   
Matching contribution
  $ 1,014,418     $ 929,869     $ 875,138  
Discretionary contribution
    188,700       150,000       99,400  
    $ 1,203,118     $ 1,079,869     $ 974,538  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
2012
   
2011
   
2010
 
                   
Balance, beginning
  $ 4,202,733     $ 3,469,525     $ 2,734,989  
Company expense
    555,407       414,478       369,950  
Employee deferrals
    405,788       381,616       371,374  
Cash payments made
    (12,298 )     (62,886 )     (6,788 )
Balance, ending
  $ 5,151,630     $ 4,202,733     $ 3,469,525