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Note 3 - Fair Value Measurements (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
  

March 31, 2021

  

March 31, 2020

 
  

Carrying Value

  

Fair Value (Level 2)

  

Carrying Value

  

Fair Value (Level 2)

 

Notes

 $145,675  $188,780  $140,278  $173,363