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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Disclosure Text Block Supplement [Abstract] |
Net Capital Cost Value | $ 5,000
Obligation Under Consent Order | 0
Net Capital Cost Value In Proposed Remedial Action Plan | 10,000
Loss Contingency Claim Asserted | $ 0

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- Definition Loss contingency claim asserted. + References No definition available. + Details
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Namespace Prefix: | gff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of net capital cost value as of the reporting date. + References No definition available. + Details
Name: | gff_NetCapitalCostValue
Namespace Prefix: | gff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of net capital cost value in Proposed Remedial Action Plan as of the reporting date. + References No definition available. + Details
Name: | gff_NetCapitalCostValueInProposedRemedialActionPlan
Namespace Prefix: | gff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Obligation under consent order. + References No definition available. + Details
Name: | gff_ObligationUnderConsentOrder
Namespace Prefix: | gff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration