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Note 9 - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 9 - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers [Line Items] |  |  |
Revenues | $ 434,925 us-gaap_SalesRevenueNet | $ 391,665 us-gaap_SalesRevenueNet | $ 375,691 us-gaap_SalesRevenueNet
Revenues, Percent | 100.00%grc_PercentageRevenueByLocation | 100.00%grc_PercentageRevenueByLocation | 100.00%grc_PercentageRevenueByLocation
UNITED STATES |  |  |
Note 9 - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers [Line Items] |  |  |
Revenues | 298,338 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 257,038 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 239,153 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Revenues, Percent | 69.00%grc_PercentageRevenueByLocation / us-gaap_StatementGeographicalAxis = country_US | 66.00%grc_PercentageRevenueByLocation / us-gaap_StatementGeographicalAxis = country_US | 64.00%grc_PercentageRevenueByLocation / us-gaap_StatementGeographicalAxis = country_US
Foreign Countries [Member] |  |  |
Note 9 - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers [Line Items] |  |  |
Revenues | $ 136,587 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember | $ 134,627 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember | $ 136,538 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember
Revenues, Percent | 31.00%grc_PercentageRevenueByLocation / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember | 34.00%grc_PercentageRevenueByLocation / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember | 36.00%grc_PercentageRevenueByLocation / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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