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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
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Note 8 - Goodwill and Other Intangible Assets (Details) - Major Components of Goodwill and Other Intangible Assets [Line Items] |  |  |
Historical Cost | $ 20,339 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 15,528 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Accumulated Amortization | 6,924 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 5,593 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Goodwill | 22,615 us-gaap_Goodwill | 18,046 us-gaap_Goodwill | 17,452 us-gaap_Goodwill
Total | 46,842 grc_IntangibleAssetsGrossIncludingGoodwill | 37,096 grc_IntangibleAssetsGrossIncludingGoodwill |
Total | 6,924 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 5,593 us-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 | 3,888 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | 3,522 us-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 | 12,175 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 8,170 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | 3,372 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 2,403 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Total | 3,372 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 2,403 us-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 | 6,620 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember | 5,790 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember |
Accumulated Amortization | 2,035 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember | 1,685 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember |
Total | 2,035 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grc_TechnologyAndDrawingsMember | 1,685 us-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 | 1,544 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 1,568 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Accumulated Amortization | 1,517 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 1,505 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Total | 1,517 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 1,505 us-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 | $ 22,615 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember | $ 18,046 us-gaap_Goodwill / us-gaap_FairValueByAssetClassAxis = us-gaap_GoodwillMember |

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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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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