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Note 11 - Significant Customer and Industry Segment Information (Tables)
 12 Months Ended
Mar. 28, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
March
28
, 20
20
(Dollars in thousands)
  
Giga-tronics
Division
    
Microsource
    
Total
  
Revenue
   $
3,521
     $
8,247
     $
11,768
  
Interest expense, net
    
(252
 )    
—
      
(252
 )
Depreciation
    
184
      
—
      
184
  
Income (loss) before income taxes
    
(3,392
 )    
2,707
      
(685
 )
Assets
    
6,011
      
2,915
      
8,926
  
March 30, 2019 (Dollars in thousands)
  
Giga-tronics
Division
    
Microsource
    
Total
  
Revenue
   $
1,935
     $
9,213
     $
11,148
  
Interest expense, net
    
(607
 )    
—
      
(607
 )
Depreciation
    
257
      
7
      
264
  
Income (loss) before income taxes
    
(4,521
 )    
3,626
      
(895
 )
Assets
    
3,979
      
2,300
      
6,279
  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
March 28,
2020
    
March 30,
2019
  
Europe
   $
13
     $
14
  
Asia
    
10
      
12
  
Rest of world
    
110
      
68
  
Total
   $
133
     $
94