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Note 4 - Inventories, Net (Tables)
9 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

December 31, 2020

  

March 31, 2020

 

Raw materials

 $8,151  $6,757 

Work-in-process

  436   329 

Finished goods

  6,370   9,768 

Less: reserve

  (2,992)  (2,624)

Inventories, net

 $11,965  $14,230