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Note 3 - Share Information (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Weighted Average Number of Shares [Table Text Block]
   
Quarters Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2012
   
2011
   
2012
   
2011
 
Weighted average number of common shares used for basic EPS
    39,285,484       39,424,336       39,253,373       39,347,237  
Effect of dilutive stock options and restricted and deferred stock unit awards
    319,745       287,047       306,241       359,514  
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS
    39,605,229       39,711,383       39,559,614       39,706,751