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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Inventories | $ 520 | $ 524
Accrued liabilities | 3,011 | 3,208
Postretirement health benefits obligation | 5,600 | 5,584
Pension | 2,386 | 1,868
Lease liabilities | 4,916 | 520
Capitalized R&D | 2,041 | 1,103
Interest | 8,703 | 3,168
Other | 1,155 | 1,399
Total deferred tax assets | 28,332 | 17,374
Valuation allowance | (390) | (462)
Net deferred tax assets | 27,942 | 16,912
us-gaap_DeferredTaxAssetsValuationAllowance | 390 | 462
grc_DeferredTaxLiabilitiesLeasesRightOfUseAssets | 4,922 | 536
Depreciation and amortization | (22,923) | (16,987)
Total deferred tax liabilities | (27,845) | (17,523)
Net deferred tax assets (liabilities) | $ 97 |
Net deferred tax assets (liabilities) |  | $ (611)

X
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liabilities. + References No definition available. + Details
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- Definition The amount of deferred tax liabilities associated with depreciation and amortization. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 + Details
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