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Note 6 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Inventories | $ 1,030,000 us-gaap_DeferredTaxAssetsInventory | $ 1,688,000 us-gaap_DeferredTaxAssetsInventory
Accrued liabilities | 2,538,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 2,341,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Postretirement health benefits obligation | 7,602,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 6,545,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Pension | 1,649,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions |
Deferred revenue | 1,267,000 us-gaap_DeferredTaxAssetsDeferredIncome |
Other | 550,000 us-gaap_DeferredTaxAssetsOther | 101,000 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 14,636,000 us-gaap_DeferredTaxAssetsGross | 10,675,000 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (336,000)us-gaap_DeferredTaxAssetsValuationAllowance | (162,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 14,300,000 us-gaap_DeferredTaxAssetsNet | 10,513,000 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities |  |
Depreciation and amortization | (17,711,000)grc_DeferredTaxLiabilitiesDepreciationAndAmortization | (16,858,000)grc_DeferredTaxLiabilitiesDepreciationAndAmortization
Pension |  | (1,634,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | (17,711,000)us-gaap_DeferredIncomeTaxLiabilities | (18,492,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities | $ (3,411,000)us-gaap_DeferredTaxLiabilities | $ (7,979,000)us-gaap_DeferredTaxLiabilities

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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