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Note 7 - Earnings Per Share (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
Net income available for shareholders
  $
4,597
    $
4,230
 
Weighted average outstanding shares of common stock
   
3,901
     
3,816
 
Dilutive effect of stock options
   
175
     
177
 
Dilutive effect of non-vested shares
   
10
     
13
 
Fully diluted shares
   
4,086
     
4,006
 
                 
Basic
  $
1.18
    $
1.11
 
Diluted
  $
1.13
    $
1.06
 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
Stock awards that were anti-dilutive
   
8
     
27
 
Stock awards subject to performance conditions
   
12
     
3
 
Total stock awards excluded from diluted EPS
   
20
     
30