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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2023
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
  

September 30, 2023

  

March 31, 2023

 
  

Carrying Value

  

Fair Value (Level 2)

  

Carrying Value

  

Fair Value (Level 2)

 

Notes

 $170,733  $155,681  $170,272  $161,072