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Note 7 - Changes in Shareholders' Equity (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   

Additional

         
   

Paid-In

   

Retained

 
   

Capital

   

Earnings

 
                 

Beginning balance at March 31, 2020:

  $ 3,804     $ 126,177  

Share based compensation

    740       -  

Dividends declared

    -       (5,647 )

Net income

    -       7,768  
                 

Ending balance at June 30, 2020:

  $ 4,544     $ 128,298  
   

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