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Note 4 - Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
2019
   
March 31,
2018
 
Land
  $
889
    $
889
 
Buildings
   
18,648
     
18,543
 
Manufacturing equipment
   
8,732
     
9,156
 
Computer equipment
   
3,698
     
3,459
 
Construction in progress
   
107
     
60
 
Other
   
1,393
     
1,221
 
Gross total
   
33,467
     
33,328
 
Accumulated depreciation
   
(11,242
)    
(9,735
)
Property, plant, and equipment, net
  $
22,225
    $
23,593