XML 30 R19.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Revenue and Contract Costs (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Contractors [Abstract] |
Pass-through Costs as a Percentage of Revenue | Our pass-through costs as a percentage of revenue for each period presented were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Pass-through costs as a percentage of revenues | 48.4% |  | 33.8% |  | 45.3% |  | 35.0%

X
- Definition [Table Text Block] for Schedule of Pass-through Costs as a Percentage of Revenue [Table] + References No definition available. + Details
Name: | gifi_ScheduleofPassthroughCostsasaPercentageofRevenueTableTextBlock
Namespace Prefix: | gifi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ContractorsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration