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Note 4 - Inventories - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Raw materials and in-process	$ 16,474	$ 21,773
Finished parts	47,317	54,209
Finished products	12,206	11,405
Total net inventories	$ 75,997	$ 87,387

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

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-Publisher FASB
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-SubTopic 10
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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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-Subparagraph (SX 210.5-02.6(a))
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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