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Note 8 - Income Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Three Months Ended
March 31,
    2019   2018
Basic weighted average common shares outstanding    
7,402
     
7,300
 
Weighted average common equivalent shares due to stock options and SUAs    
64
     
78
 
Diluted weighted average common shares outstanding    
7,466
     
7,378