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Note 3 - Stock-based Compensation and Shareholders' Equity (Tables)
6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Six months ended June 30,

 

2013

   

2012

 

Risk free interest rate

    0.35 %     0.39 %

Dividend yield

    4.26       4.68  

Volatility

    34.10       33.81  

Expected life (years)

    5.00       5.00  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
     

Number

of options

   

Weighted

average

exercise price

   

Weighted average remaining contractual term

(in years)

   

Aggregate

intrinsic value

 

Outstanding at December 31, 2012

    128,225       22.72                  
 

Granted

    20,000       23.20                  
 

Exercised

    (28,725 )     20.35                  
 

Forfeited

    (2,600 )     19.79                  

Outstanding at June 30, 2013

    116,900     $ 23.45       2.41     $ 370  

Exercisable at June 30, 2013

    55,900     $ 25.52       1.16     $ 190