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Note 7 - Changes in Shareholders' Equity (Tables)
3 Months Ended
Jun. 30, 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
 
   
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