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Note 4 - Equipment and Leasehold Improvements (Tables)
 9 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Dec
ember
3
1
,
2019
    
March 31,
2019
  
   
(in thousands)
  
Equipment
   $
18,804
     $
18,679
  
Leasehold improvements
    
14,735
      
14,723
  
Furniture and fixtures
    
369
      
348
  
     
33,908
      
33,750
  
Less accumulated depreciation and amortization
    
(20,702
)
    
(19,254
)
Construction-in-progress
    
268
      
256
  
Equipment and leasehold improvements, net
   $
13,474
     $
14,752