Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Gain on Sale of Product Line (Details)

v2.4.1.9
Note 5 - Gain on Sale of Product Line (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 28, 2013
Jun. 29, 2013
Dec. 28, 2013
Mar. 29, 2014
Apr. 30, 2013
Dec. 06, 2013
Dec. 31, 2013
Mar. 18, 2013
Note 5 - Gain on Sale of Product Line (Details) [Line Items]                
Nontrade Receivables, Current               $ 1,000,000us-gaap_NontradeReceivablesCurrent
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax 97,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 816,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 913,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 913,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax        
Contingent Consideration, Hold Back for Contingent Liabilities             (150,000)giga_ContingentConsiderationHoldBackforContingentLiabilities  
Proceeds at Closing [Member]                
Note 5 - Gain on Sale of Product Line (Details) [Line Items]                
Proceeds from Divestiture of Businesses         800,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= giga_ProceedsAtClosingMember
     
Training Employees [Member]                
Note 5 - Gain on Sale of Product Line (Details) [Line Items]                
Proceeds from Divestiture of Businesses         50,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= giga_TrainingEmployeesMember
     
Other Nonrecurring Expense         34,000us-gaap_OtherNonrecurringExpense
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= giga_TrainingEmployeesMember
     
Inventory [Member]                
Note 5 - Gain on Sale of Product Line (Details) [Line Items]                
Proceeds from Divestiture of Businesses           150,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= giga_InventoryMember
   
Revenues       $ 53,000us-gaap_Revenues
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= giga_InventoryMember