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Note 6 - Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31, 2020
   
March 31, 2019
 
Land
  $
889
    $
889
 
Buildings
   
18,880
     
18,648
 
Manufacturing equipment
   
9,851
     
8,732
 
Computer equipment
   
3,601
     
3,698
 
Construction in progress
   
242
     
107
 
Other
   
1,344
     
1,393
 
Gross total
   
34,807
     
33,467
 
Accumulated depreciation
   
(12,741
)    
(11,242
)
Property, plant, and equipment, net
  $
22,066
    $
22,225