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Note 3 - Equipment and Leasehold Improvements, Net (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
201
8
    
201
7
  
   
(in thousands)
  
Equipment(1)
   $
17,935
     $
17,492
  
Leasehold improvements
    
14,248
      
13,892
  
Furniture and fixtures
    
348
      
380
  
     
32,531
      
31,764
  
Less accumulated depreciation and amortization
    
(17,346
)
    
(15,835
)
Construction in-progress
    
549
      
783
  
Equipment and leasehold improvements, net
   $
15,734
     $
16,712