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Note 7 - Changes in Shareholders' Equity and Comprehensive Income: (Tables)
 9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
Additional
   
 
 
 
   
Paid-In
   
Retained
 
   
Capital
   
Earnings
 
                 
Beginning balance at March 31, 2019:
   $
12,478
     $
122,172
  
Share based compensation
    
635
      
-
  
Dividends declared
    
-
      
(5,518
 )
Repurchase and retirement of common stock
    
(11,496
 )    
-
  
Net income
    
-
      
5,343
  
                 
Ending balance at June 30, 2019:
   $
1,617
     $
121,997
  
                 
Share based compensation
    
730
      
-
  
Dividends declared
    
-
      
(5,447
 )
Net income
    
-
      
6,665
  
                 
Ending balance at September 30, 2019:
   $
2,347
     $
123,215
  
                 
Share based compensation
    
716
      
-
  
Dividends declared
    
-
      
(5,437
 )
Net income
    
-
      
6,840
  
                 
Ending balance at December 31, 2019:
   $
3,063
     $
124,618
  
   
Additional
   
 
 
 
   
Paid-In
   
Retained
 
   
Capital
   
Earnings
 
                 
Beginning balance at March 31, 2018:
   $
9,381
     $
106,320
  
Share based compensation
    
719
      
-
  
Dividends declared
    
-
      
(5,151
 )
Net income
    
-
      
12,582
  
                 
Ending balance at June 30, 2018:
   $
10,100
     $
113,751
  
                 
Share based compensation
    
781
      
-
  
Dividends declared
    
-
      
(5,573
 )
Net income
    
-
      
10,752
  
                 
Ending balance at September 30, 2018:
   $
10,881
     $
118,930
  
                 
Share based compensation
    
812
      
-
  
Dividends declared
    
-
      
(5,582
 )
Net income
    
-
      
7,787
  
                 
Ending balance at December 31, 2018:
   $
11,693
     $
121,135