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Note 4 - Inventories (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

June 30, 2020

  

March 31, 2020

 

Raw materials

 $7,665  $6,757 

Work-in-process

  324   329 

Finished goods

  7,582   9,768 

Less: reserve

  (2,671)  (2,624)

Inventories, net

 $12,900  $14,230