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Note 5 - Earnings Per Share ("EPS") (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Years Ended December 31,
    2017   2016   2015
Shares used in the calculation of basic earnings per share    
14,575
     
14,682
     
14,934
 
Effect of dilutive securities:                        
Stock options, SAR's, RSA's and RSU's    
493
     
434
     
387
 
Diluted shares used in the calculation of earnings per share    
15,068
     
15,116
     
15,321