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Note 9 - Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  March 31, 2022  March 31, 2021 

Land

 $980  $270 

Construction in progress - equipment

  573   220 

Buildings

  5,270   1,630 

Equipment and software

  43,668   41,652 

Finance lease - right of use asset

  8    

Furniture and fixtures

  1,379   1,333 

Leasehold improvements

  6,634   6,308 

Property, plant and equipment, gross

  58,512   51,413 

Less accumulated depreciation

  (44,856)  (42,416)

Property, plant and equipment, net

 $13,656  $8,997