Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)

v2.4.1.9
Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 27, 2014
Mar. 29, 2014
Trade accounts receivable, allowance (in Dollars) $ 45us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 44us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred Stock, Shares Authorized 19,500us-gaap_PreferredStockSharesAuthorized  
Prеfеrrеd Stock, Sharеs Issuеd 18,534us-gaap_PreferredStockSharesIssued  
Preferred Stock, Shares Outstanding 18,534us-gaap_PreferredStockSharesOutstanding  
Preferred Stock, Liquidation Preference (in Dollars) 3,540us-gaap_PreferredStockLiquidationPreferenceValue  
Common stock, par value (in Dollars per share) $ 0us-gaap_CommonStockParOrStatedValuePerShare $ 0us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized 40,000,000us-gaap_CommonStockSharesAuthorized 40,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued 5,444,747us-gaap_CommonStockSharesIssued 5,181,247us-gaap_CommonStockSharesIssued
Common stock, outstanding 5,444,747us-gaap_CommonStockSharesOutstanding 5,181,247us-gaap_CommonStockSharesOutstanding
Series A Preferred Stock [Member]    
Preferred Stock, Shares Authorized 250,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
250,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Prеfеrrеd Stock, Sharеs Issuеd 0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Preferred Stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B, C, and D Preferred Stock [Member]    
Preferred Stock, Shares Authorized 19,500us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
19,500us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
Prеfеrrеd Stock, Sharеs Issuеd 18,534us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
18,534us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
Preferred Stock, Shares Outstanding 18,534us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
18,534us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
Preferred Stock, Liquidation Preference (in Dollars) $ 3,540us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember
$ 3,540us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= giga_SeriesBCandDPreferredStockMember