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Note 14 - Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]
   

2014

   

2013

   

2012

 
                         

Matching contribution

  $ 1,179,979     $ 1,129,726     $ 1,014,418  

Discretionary contribution

    198,800       186,000       188,700  
    $ 1,378,779     $ 1,315,726     $ 1,203,118  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   

2014

   

2013

   

2012

 
                         

Balance, beginning

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

Company expense

    661,611       557,663       555,407  

Employee deferrals

    628,589       525,469       405,788  

Cash payments made

    (10,876 )     (10,394 )     (12,298 )

Balance, ending

  $ 7,503,692     $ 6,224,368     $ 5,151,630