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

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