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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Contract with Customer, Asset and Liability (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) Vechicle | Dec. 31, 2020 USD ($) Vechicle
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Contract with customer, asset, revenue recognized in excess of amounts billed, current | $ 1.1 | $ 2.3
Contract with customer, liability, revenue recognized | 3.7 | 9.9
Contract with customer, liability, accrued contract losses, current | $ 3.9 | $ 5.4
Forty-Vehicle Ferry |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Number of vehicle ferry projects | Vechicle | 2 | 2

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- Definition Contract with customer, asset, revenue recognized in excess of amounts billed, current. + References No definition available. + Details
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Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with customer liability accrued contract losses current. + References No definition available. + Details
Name: | gifi_ContractWithCustomerLiabilityAccruedContractLossesCurrent
Namespace Prefix: | gifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of vehicle ferry projects. + References No definition available. + Details
Name: | gifi_NumberOfVehicleFerryProjects
Namespace Prefix: | gifi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=gifi_FortyVehicleFerryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |