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Note 10 - Significant Customer and Industry Segment Information (Tables)
 3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Month Periods
Ended
    
 
 
 
  
Three Month Periods
Ended
    
 
 
 
(In thousands)
  
At June
30
,
201
8
    
June
30
,
201
8
    
 
 
 
  
At June 2
4
,
201
7
    
June 2
4
,
201
7
    
 
 
 
   
Assets
    
Net Sales
    
Net Income
(Loss)
    
Assets
    
Net Sales
    
Net Income
(Loss)
  
Giga-tronics Division
   $
4,418
     $
38
     $
(1559
 )   $
6,153
     $
297
     $
(1,849
)
Microsource
    
1,953
      
1,061
      
1,272
      
2,907
      
1,694
      
591
  
Total
   $
6,371
     $
1,099
     $
(287
 )   $
9,060
     $
1,991
     $
(1,258
)