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Note 3 - Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
September 30, 2019
   
March 31, 2019
 
   
Carrying Value
   
Fair Value (Level 2)
   
Carrying Value
   
Fair Value
 
Notes
  $
137,682
    $
184,575
    $
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    $
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