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Note 12 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Shares
Under
Option
 
 
Weighted-
Average
Exercise Price
 
                 
Outstanding—January 1, 2013:
    235,442     $ 11.38  
Granted
    35,000       10.44  
Exercised
    (7,257 )     10.94  
Canceled
    (99,087 )     11.71  
                 
Outstanding—December 31, 2013:
    164,098     $ 10.99  
Granted
    -       -  
Exercised
    (77,708 )     10.88  
Canceled
    (42 )     11.22  
                 
Outstanding—December 31, 2014:
    86,348     $ 11.09  
Granted
    -       -  
Exercised
    (20,250 )     11.65  
Canceled
    -       -  
                 
Outstanding—December 31, 2015:
    66,098     $ 10.92  
                 
Options exercisable—December 31, 2015:
    37,893     $ 10.93  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
2013
 
         
Dividend yield
    0%  
Volatility range
    62.69%  
Risk-free rate range
    0.61%  
Expected life (years)     4.3  
Fair value of options (per share)
    $5.13  
Schedule of Share-based Compensation, Activity [Table Text Block]
 
 
Shares
Under
Option
 
 
Weighted-
Average
Exercise
Price
 
 
Weighted-
Average
Remaining
Contractual
Term
 
 
Aggregate
Intrinsic
Value*
 
           
(per share)
   
(in years)
         
Outstanding at January 1, 2015
    86,348     $ 11.09                  
Granted
    -       -                  
Exercised
    (20,250 )     11.65                  
Canceled/forfeited/expired
    -       -                  
Outstanding at December 31, 2015
    66,098     $ 10.92       4.1     $ 1,101,716  
                                 
Fully vested and
exercisable at December 31, 2015
    37,893     $ 10.93       2.5     $ 631,168  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
Number of
Options
 
 
Weighted-
Average
Grant Date
Fair Value
 
                 
Nonvested at January 1, 2015
    48,109     $ 6.10  
Granted
    -       -  
Canceled/forfeited/expired
    -       -  
Vested
    (19,904 )     6.15  
Nonvested at December 31, 2015
    28,205     $ 6.07  
 
 
Number of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value (1)
 
                 
Nonvested at January 1, 2015
    7,600     $ 42.65  
Granted
    1,225       57.27  
Canceled/forfeited/expired
    -       -  
Vested
    (3,125 )     48.38  
Nonvested at December 31, 2015
    5,700     $ 42.65  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Exercise
Price
 
 
Shares
Under
Outstanding
Options
 
 
Weighted-
Average
Remaining
Contractual
Term
 
 
Shares
Under
Exercisable
Options
 
               
(in years)
         
$ 10.44       15,000       2.2       15,000  
$ 10.90       6,000       1.4       6,000  
$ 10.90       29,600       6.4       2,000  
$ 11.22       7,498       4.9       6,893  
$ 11.54       4,000       1.2       4,000  
$ 11.75       4,000       0.2       4,000  
          66,098       4.1       37,893