Annual report pursuant to Section 13 and 15(d)

Note 11 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Capital Leases

v2.4.1.9
Note 11 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Capital Leases (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Note 11 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Capital Leases [Line Items]  
2016 $ 83us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2017 26us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2018 26us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2019 20us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2020 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Total 158us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Principal [Member]  
Note 11 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Capital Leases [Line Items]  
2016 69us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_DebtInstrumentAxis
= giga_PrincipalMember
2017 17us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_DebtInstrumentAxis
= giga_PrincipalMember
2018 20us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_DebtInstrumentAxis
= giga_PrincipalMember
2019 18us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
/ us-gaap_DebtInstrumentAxis
= giga_PrincipalMember
2020 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
/ us-gaap_DebtInstrumentAxis
= giga_PrincipalMember
Total 127us-gaap_CapitalLeasesFutureMinimumPaymentsDue
/ us-gaap_DebtInstrumentAxis
= giga_PrincipalMember
Interest [Member]  
Note 11 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Capital Leases [Line Items]  
2016 14us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_DebtInstrumentAxis
= giga_InterestMember
2017 9us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_DebtInstrumentAxis
= giga_InterestMember
2018 6us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_DebtInstrumentAxis
= giga_InterestMember
2019 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
/ us-gaap_DebtInstrumentAxis
= giga_InterestMember
Total $ 31us-gaap_CapitalLeasesFutureMinimumPaymentsDue
/ us-gaap_DebtInstrumentAxis
= giga_InterestMember