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Note 7 - Income Per Share (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Three Months Ended
June 30,
  Six Months Ended
June 30,
    2017   2016   2017   2016
Weighted average common shares outstanding, basic    
7,239
     
7,175
     
7,228
     
7,159
 
Weighted average common equivalent shares due to stock options and RSUs    
84
     
75
     
84
     
79
 
Weighted average common shares outstanding, diluted    
7,323
     
7,250
     
7,312
     
7,238