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Note 3 - Earnings Per Share (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 88,354 90,528 88,354 90,528 88,774 89,077
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share)   $ 22.33 $ 17.55 $ 17.55    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share)   $ 40.24 $ 40.24 $ 40.24    
Incremental Common Shares Attributable to Share-based Payment Arrangements 1,872,000 149,000 1,208,000 75,000    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   81,528 79,354 81,528    
Dilutive Securities [Member]
           
Incremental Common Shares Attributable to Share-based Payment Arrangements     9,000