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Note 10 - Significant Customer and Industry Segment Information - Breakdown of Customer and Segment Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 24, 2017
Mar. 31, 2018
Assets $ 6,371,000 $ 9,060,000 $ 8,431,000 [1]
Sales Revenue 2,843,000 1,991,000  
Net Income (Loss) Attributable to Parent, Total (287,000) (1,258,000) $ (3,100,000)
Gigatronics Division [Member]      
Assets 4,418,000 6,153,000  
Sales Revenue 38,000 297,000  
Net Income (Loss) Attributable to Parent, Total (1,559,000) (1,849,000)  
Microsource [Member]      
Assets 1,953,000 2,907,000  
Sales Revenue 1,061,000 1,694,000  
Net Income (Loss) Attributable to Parent, Total $ 1,272,000 $ 591,000  
[1] Derived from the audited consolidated financial statements as of and for the fiscal year ended March 31, 2018.