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Note 7 - Net Income Per Share (Tables)
6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three
M
onths
E
nded
September
3
0
,
   
Six
M
onths
E
nded
September
3
0
,
 
   
201
7
   
201
6
   
201
7
   
201
6
 
Net income available for share
holders
  $
2,353
    $
2,358
    $
3,870
    $
4,288
 
Weighted average outstanding shares of common stock
   
3,764
     
3,669
     
3,754
     
3,657
 
Dilutive effect of stock options
   
171
     
162
     
180
     
159
 
Common stock and equivalents
   
3,935
     
3,831
     
3,934
     
3,816
 
                                 
Net income per share:
                               
Basic
  $
0.63
    $
0.64
    $
1.03
    $
1.17
 
Diluted
   
0.60
     
0.62
     
0.98
     
1.12