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Note 5 - Inventories - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Raw materials and in-process	$ 40,448	$ 23,263
Finished parts	57,224	52,039
Finished products	13,461	10,346
Total net inventories	$ 111,133	$ 85,648

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

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Period Type:	instant

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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-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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