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Note 4 - Inventories - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Raw materials and in-process	$ 40,752	$ 40,448
Finished parts	61,536	57,224
Finished products	13,528	13,461
Total net inventories	$ 115,816	$ 111,133

X

- Definition

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

+ References

No definition available.

+ Details

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

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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 210
-SubTopic 10
-Name Accounting Standards Codification
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