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Note 10 - Stock-Based Compensation Plans (Details) (USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Dec. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 64,050        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)   64,757      
OptionsExercisePrice       $ 19.21 $ 18.54
Stock or Unit Option Plan Expense $ 262,000   $ 247,000    
Estimated Options Stock Incentive Forfeiture Rate     0.00% 33.00%  
Restricted Stock Shares Issued 37,886 42,552