Annual report pursuant to Section 13 and 15(d)

Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area

v2.4.1.9
Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area [Line Items]    
Revenue $ 1,467us-gaap_Revenues $ 1,477us-gaap_Revenues
Americas [Member]    
Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area [Line Items]    
Revenue 26us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember 		169us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Europe [Member]    
Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area [Line Items]    
Revenue 179us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember 		661us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Asia [Member]    
Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area [Line Items]    
Revenue 1,085us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember 		507us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Rest of World [Member]    
Note 7 - Significant Customer and Industry Segment Information (Details) - Export Sales by Geographic Area [Line Items]    
Revenue $ 177us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= giga_RestOfWorldMember 		$ 140us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= giga_RestOfWorldMember