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Note 4 - Inventories - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Raw materials and in-process	$ 36,897	$ 37,037
Finished parts	46,375	52,458
Finished products	15,933	14,661
Total net inventories	$ 99,205	$ 104,156

X

- Definition

Carrying amount of finished parts, net of valuation reserves and adjustments, as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	grc_InventoryFinishedPartsNetOfReserves
Namespace Prefix:	grc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Balance Type:	debit
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X

- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
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-Subparagraph (SX 210.5-02(6))
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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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X

- Definition

The aggregate carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of items which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

+ References

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-Topic 330
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-Name Accounting Standards Codification
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