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Note 10 - Property, Plant and Equipment (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30, 2019
   
March 31, 2019
 
Construction in progress - equipment
  $
1,336
    $
603
 
Equipment and software
   
45,791
     
45,705
 
Furniture and fixtures
   
1,271
     
1,269
 
Leasehold improvements
   
1,983
     
1,955
 
Property, plant and equipment, gross
   
50,380
     
49,532
 
Less accumulated depreciation
   
(41,633
)    
(40,560
)
Property, plant and equipment, net
  $
8,747
    $
8,972