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v3.19.3.a.u2

Subsequent Events - Additional Information (Details) - USD ($) $ in Millions | Feb. 28, 2020 | Dec. 31, 2019
--- | --- | ---
Subsequent Event [Line Items] |  |
Customer change order settlement amount |  | $ 0.0
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Payment from customer change order settlement | $ 10.0 |

X
- Definition Customer change order settlement amount. + References No definition available. + Details
Name: | gifi_CustomerChangeOrderSettlementAmount
Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Payments from customer change order settlement. + References No definition available. + Details
Name: | gifi_PaymentFromCustomerChangeOrderSettlement
Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |