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Note 4 - Net Income Per Share (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
Quarter Ended June 30
 
   
2020
   
2019
 
Weighted average common shares outstanding – basic
   
4,835,038
     
4,846,010
 
Dilutive effect of stock options
   
119
     
4,378
 
Shares used in computing net income per share – diluted
   
4,835,157
     
4,850,388