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Note 6 - Indebtedness (Tables)
6 Months Ended
Sep. 30, 2021
Notes Tables  
Convertible Debt [Table Text Block]
  

September 30, 2021

  

March 31, 2021

 

Principal outstanding

 $172,500  $172,500 

Unamortized debt discount attributable to equity

  -   (23,497)

Unamortized debt issuance costs

  (3,583)  (3,328)

Net carrying value

 $168,917  $145,675 
Interest Expense on Convertible Debt [Table Text Block]
  

Three Months Ended September 30,

  

Six Months Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Coupon interest expense at 1.375%

 $593  $593  $1,186  $1,186 

Amortization of debt discounts and issuance costs

  222   1,341   443   2,667 

Total

 $815  $1,934  $1,629  $3,853