Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Warranty Obligations (Details) - Reconciliation of Company's Estimated Warranty Obligations

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Note 10 - Warranty Obligations (Details) - Reconciliation of Company's Estimated Warranty Obligations (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 27, 2014
Dec. 28, 2013
Reconciliation of Company's Estimated Warranty Obligations [Abstract]        
Balance at beginning of period $ 73us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 80us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 61us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 114us-gaap_ProductWarrantyAccrualClassifiedCurrent
Provision, net 29giga_ProductWarrantyAccuralProvisionNet 6giga_ProductWarrantyAccuralProvisionNet 56giga_ProductWarrantyAccuralProvisionNet (3)giga_ProductWarrantyAccuralProvisionNet
Warranty costs incurred (24)us-gaap_ProductWarrantyExpense (17)us-gaap_ProductWarrantyExpense (39)us-gaap_ProductWarrantyExpense (42)us-gaap_ProductWarrantyExpense
Balance at end of period $ 78us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 69us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 78us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 69us-gaap_ProductWarrantyAccrualClassifiedCurrent