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Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items] |  |  |  |
Ending balance | $ (17,326)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ (8,461)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Currency Translation Adjustments [Member] |  |  |  |
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items] |  |  |  |
Ending balance | (4,338)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember | (1,062)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember | 319 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember | (118)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember
Current period credit (charge) | (3,276)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember | (1,381)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember | 437 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_CurrencyTranslationAdjustmentsMember |
Pension And OPEB Adjustments [Member] |  |  |  |
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items] |  |  |  |
Ending balance | (12,988)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | (7,399)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | (16,601)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | (15,926)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember
Reclassifications adjustments | 483 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | 5,526 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | 4,729 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember |
Current period credit (charge) | (9,294)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | 8,925 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | (5,716)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember |
Income tax benefit (charge) | 3,222 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | (5,249)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember | 312 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_PensionAndOPEBAdjustmentsMember |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Note 5 - Accumulated Other Comprehensive Loss (Details) - Components of Accumulated Other Comprehensive Income (Loss) as Reported in the Consolidated Balance Sheets [Line Items] |  |  |  |
Ending balance | (17,326)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | (8,461)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | (16,282)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | (16,044)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember
Reclassifications adjustments | 483 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember |  |  |
Current period credit (charge) | (12,087)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | 13,070 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | (550)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember |
Income tax benefit (charge) | $ 3,222 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | $ (5,249)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember | $ 312 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = grc_AccumulatedOtherComprehensiveIncomeLossMember |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans. + References No definition available. + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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