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Note 7 - Income Per Share (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
 
 
 
 
Three Months Ended
September 30,
 
 
Nine Months Ended
September 30,
    2017   2016   2017   2016
Weighted average common shares outstanding, basic    
7,264
     
7,195
     
7,240
     
7,183
 
Weighted average common equivalent shares due to stock options and RSUs    
89
     
87
     
86
     
82
 
Weighted average common shares outstanding, diluted    
7,353
     
7,282
     
7,326
     
7,265