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Note 11 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
2020
   
2019
 
   
Carrying
   
Estimated
   
Carrying
   
Estimated
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
   
(In thousands)
 
                                 
Long-term debt, including current portion
  $
217,581
    $
217,559
    $
266,245
    $
266,140