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