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Note G - Fair Value Measurements (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   
June 30, 2019
   
March 31, 2019
 
   
Face value
   
Fair value
   
Face Value
   
Fair value
 
                                 
Long-term debt
 
$
150,000
   
$
147,750
    $
150,000
    $
145,688