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Note 2 - Net Income Per Share (Tables)
9 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
December 31
,
   
Nine Months Ended
December 31
,
 
   
201
7
   
201
6
   
201
7
   
201
6
 
Net income (numerator)
:
                               
Net incom
e
  $
9,064
    $
4,823
    $
27,100
    $
16,316
 
Shares (denominator)
:
                               
Weighted average number of common shares
outstanding used in basic computatio
n
   
20,368
     
20,253
     
20,337
     
20,223
 
Common shares issuable upon vesting o
f
restricted stoc
k
   
47
     
145
     
90
     
140
 
Common shares issuable upon conversio
n
of preferred share
s
   
10
     
10
     
10
     
10
 
Shares used in diluted computatio
n
   
20,425
     
20,408
     
20,437
     
20,373
 
Net income per common share
:
                               
Basi
c
  $
0.45
    $
0.24
    $
1.33
    $
0.81
 
Dilute
d
  $
0.44
    $
0.24
    $
1.33
    $
0.80