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Note 12 - Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

No. of

   

Weighted Average

 
   

Shares

   

Exercise Price

 

Outstanding December 31, 2012

    1,229,834     $ 5.62  

Granted

    405,768       5.72  

Exercised

    (412,882 )     5.37  

Lapsed

    (62,300 )     5.34  

Cancelled

    (46,362 )     5.84  

Outstanding December 31, 2013

    1,114,058     $ 5.76  

Granted

    397,218       8.30  

Exercised

    (360,318 )     5.70  

Lapsed

    (20,400 )     7.92  

Cancelled

    (12,500 )     6.43  

Outstanding December 31, 2014

    1,118,058     $ 6.63  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Range of

         

Weighted Average Remaining

   

Weighted Average

 

Exercise Price

 

Shares

   

Contractual Life (Years)

   

Exercise Price

 

$3.82

- $4.90     60,666       3.91     $ 4.49  

$5.55

- $7.36     919,292       2.99     $ 6.28  

$7.96

- $10.38     138,100       5.50     $ 9.89  

$3.82

- $10.38     1,118,058       3.35     $ 6.63  
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]
   

No. of

   

Weighted Average

 
   

Shares

   

Exercise Price

 

Outstanding December 31, 2012

    352,952     $ 5.80  

Granted

    119,432       5.65  

Exercised

    (19,572 )     5.87  

Lapsed

    -       -  

Cancelled

    -       -  

Outstanding December 31, 2013

    452,812     $ 5.76  

Granted

    137,382       7.36  

Exercised

    (68,170 )     5.85  

Lapsed

    -       -  

Cancelled

    -       -  

Outstanding December 31, 2014

    522,024     $ 6.17  
Schedule of Share-based Compensation, Activity [Table Text Block]

Range of

         

Weighted Average Remaining

   

Weighted Average

 

Exercise Price

 

SARS

   

Contractual Life (Years)

   

Exercise Price

 

 

$4.90       33,184       0.08     $ 4.90  

$5.62

- $7.36     488,840       2.49     $ 6.26  

$4.90

- $7.36     522,024       2.34     $ 6.17  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

SARS

   

Options

 

Exercise price

               

2014

  $ 7.36       $7.36-$10.38  

2013

  $ 5.65       $5.65-$5.88  
                 

Market price

               

2014

  $ 7.36       $7.36-$10.38  

2013

  $ 5.65       $5.65-$5.88  
                 

Risk free interest rate (1)

               

2014

    1.5 %     1.5%-2.6 %

2013

    0.9 %     0.9%-1.7 %
                 

Expected award life (2) (in years)

    5       5-10  
                 

Expected volatility (3)

               

2014

    42.5 %     37.3%-42.5 %

2013

    46.0 %     36.7%-46.0 %
                 

Expected dividend yield (4)

               

2014

    3.7 %     2.9%-3.7 %

2013

    4.8 %     4.6%-4.8 %