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Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items]
Historical Cost	$ 20,339us-gaap_IntangibleAssetsGrossExcludingGoodwill	$ 15,528us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization	6,924us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	5,593us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Goodwill	22,615us-gaap_Goodwill	18,046us-gaap_Goodwill	17,452us-gaap_Goodwill
Total	46,842grc_IntangibleAssetsGrossIncludingGoodwill	37,096grc_IntangibleAssetsGrossIncludingGoodwill
Total	6,924us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	5,593us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Trademarks and Trade Names [Member]
Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items]
Trade names & trademarks	3,888us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember	3,522us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Customer Relationships [Member]
Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items]
Historical Cost	12,175us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	8,170us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	3,372us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	2,403us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Total	3,372us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	2,403us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Technology And Drawings [Member]
Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items]
Historical Cost	6,620us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember	5,790us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember
Accumulated Amortization	2,035us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember	1,685us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember
Total	2,035us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember	1,685us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember
Other Intangible Assets [Member]
Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items]
Historical Cost	1,544us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	1,568us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization	1,517us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	1,505us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Total	1,517us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	1,505us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Goodwill [Member]
Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items]
Goodwill	$ 22,615us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember	$ 18,046us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember

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- Definition

The gross amount of intangible assets including goodwill.

+ References

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

+ References

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-Publisher FASB

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-Topic 350

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

+ References

No definition available.

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