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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)