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Note 11 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

2021

  

2020

 
  

Carrying

  

Estimated

  

Carrying

  

Estimated

 
  

Amount

  

Fair Value

  

Amount

  

Fair Value

 
  (in thousands) 
                 

Long-term debt, including current portion

 $98,585  $97,226  $217,581  $217,559