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Note 10 - Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Years Ended December 31,
    2016   2015   2014
Basic weighted average common shares outstanding during the year    
7,190
     
7,102
     
7,028
 
Weighted average common equivalent shares due to stock options and restricted stock units    
85
     
104
     
147
 
Diluted weighted average common shares outstanding during the year    
7,275
     
7,206
     
7,175