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Note 4 - Supplemental Balance Sheets Information (Tables)
9 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

December 31, 2021

  

March 31, 2021

 

Raw materials

 $13,962  $5,755 

Work in process

  1,956   426 

Finished goods

  7,801   4,997 

Inventories, net

 $23,719  $11,178 
Other Current Liabilities [Table Text Block]
  

December 31, 2021

  

March 31, 2021

 

Accrued business taxes

 $6,289  $6,397 

Current operating lease liabilities

  2,733   1,023 

Interest payable

  918   303 

Warranty

  606   253 

Accrued professional services

  547   473 

Other

  1,394   1,496 

Total other accrued expenses

 $12,487  $9,945