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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
	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	$ 434,925us-gaap_SalesRevenueNet	$ 391,665us-gaap_SalesRevenueNet	$ 375,691us-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	298,338us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	257,038us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	239,153us-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	$ 136,587us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember	$ 134,627us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember	$ 136,538us-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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The percentage of revenues by location.

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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

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