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Note 11 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Mar. 31, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
2019
   
2018
 
   
Carrying
   
Estimated
   
Carrying
   
Estimated
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
   
(In thousands)
 
                                 
Long-term debt, including current portion
  $
266,245
    $
266,140
    $
409,396
    $
408,942