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Note 6 - Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Options

Outstanding

   

Weighted

Average

Exercise Price

   

Aggregate

Intrinsic

Value(1)

   

Weighted

Average

Contractual

Term

(years)

 

Balance at December 31, 2015

    546,460     $ 8.62                  

Granted

                           

Exercised

                           

Forfeited

                           

Balance at March 31, 2016

    546,460     $ 8.62     $ 461,028       2.81  

Exercisable at March 31, 2016

    437,793     $ 9.04     $ 200,228       1.34  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   

For the three months ended

March 31, 2016

   

For the three months ended

March 31, 2015

 
   

Shares

   

Weighted-

Average

Grant Date

Fair Value

   

Shares

   

Weighted-

Average

Grant Date

Fair Value

 

Nonvested at beginning of year

    37,848     $ 6.24       37,727     $ 5.56  

Granted

    10,723       9.45       8,670       7.70  

Vested

    (10,938 )     5.65       (10,848 )     5.56  

Cancelled

                       

Nonvested at the end of the period

    37,633     $ 7.33       35,549     $ 6.08