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Note 3 - Fair Value Measurements (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
   
Carrying Value
   
Fair Value (Level 2)
   
Carrying Value
   
Fair Value
 
Notes
  $
138,967
    $
188,241
    $
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    $
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