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Note 13 - Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]
   

2013

   

2012

   

2011

 
                         

Matching contribution

  $ 1,046,526     $ 1,014,418     $ 929,869  

Discretionary contribution

    186,000       188,700       150,000  
    $ 1,232,526     $ 1,203,118     $ 1,079,869  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   

2013

   

2012

   

2011

 
                         

Balance, beginning

  $ 5,151,630     $ 4,202,733     $ 3,469,525  

Company expense

    557,663       555,407       414,478  

Employee deferrals

    525,469       405,788       381,616  

Cash payments made

    (10,394 )     (12,298 )     (62,886 )

Balance, ending

  $ 6,224,368     $ 5,151,630     $ 4,202,733