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Note 12 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

As of:

 
  

March 31,

  

March 31,

 
  

2023

  

2022

 
  

Carrying

  

Estimated

  

Carrying

  

Estimated

 
  

Amount

  

Fair Value

  

Amount

  

Fair Value

 
                 

Long-term debt, including current portion

 $442,695  $436,293  $113,624  $108,608