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Note 6 - Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
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
                           
Expired
    (333,960 )     9.09                  
Forfeited
    (6,000 )     6.90                  
Balance at June 30, 2016
    206,500     $ 7.90     $ 406,630       6.84  
Exercisable at June 30, 2016
    82,100     $ 9.41     $ 84,434       4.36  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   
For the six months ended June 30, 2016
   
For the six months ended June 30, 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  
Forfeited
    (6,529 )     7.27              
Nonvested at the end of the period
    31,104     $ 7.34       35,549     $ 6.08