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Note 6 - Income Taxes (Details) - Components of Income Tax Expense (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 6 - Income Taxes (Details) - Components of Income Tax Expense [Line Items] |  |  |
Income before taxes | $ 53,734 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 44,277 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 42,447 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Current Expense: |  |  |
Federal | 16,638 us-gaap_CurrentFederalTaxExpenseBenefit | 12,159 us-gaap_CurrentFederalTaxExpenseBenefit | 11,542 us-gaap_CurrentFederalTaxExpenseBenefit
Foreign | 946 us-gaap_CurrentForeignTaxExpenseBenefit | 792 us-gaap_CurrentForeignTaxExpenseBenefit | (324)us-gaap_CurrentForeignTaxExpenseBenefit
State and local | 1,376 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 981 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 1,021 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
| 18,960 us-gaap_CurrentIncomeTaxExpenseBenefit | 13,932 us-gaap_CurrentIncomeTaxExpenseBenefit | 12,239 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (benefit) expense: |  |  |
Federal | (1,181)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 108 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 2,109 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign | (114)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (38)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (189)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local | (72)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 171 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 85 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
| (1,367)us-gaap_DeferredIncomeTaxExpenseBenefit | 241 us-gaap_DeferredIncomeTaxExpenseBenefit | 2,193 us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense | 17,593 us-gaap_IncomeTaxExpenseBenefit | 14,173 us-gaap_IncomeTaxExpenseBenefit | 14,244 us-gaap_IncomeTaxExpenseBenefit
UNITED STATES |  |  |
Note 6 - Income Taxes (Details) - Components of Income Tax Expense [Line Items] |  |  |
Income before taxes | 49,692 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US | 40,374 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US | 40,019 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US
Foreign Countries [Member] |  |  |
Note 6 - Income Taxes (Details) - Components of Income Tax Expense [Line Items] |  |  |
Income before taxes | $ 4,042 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember | $ 3,903 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember | $ 2,428 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = grc_ForeignCountriesMember

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