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Note 9 - Common Share Repurchases (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Oct. 29, 2021
Stock Repurchased and Retired During Period, Value	$ 918
The Share Repurchase Program [Member]
Share Repurchase Program, Amount Authorized			$ 50,000
Stock Repurchased and Retired During Period, Shares (in shares)	24,546	0
Stock Repurchased and Retired During Period, Value	$ 900
Share Repurchase Program, Available for Repurchase, Amount	$ 48,100

X

- Definition

The amount authorized under a share repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	grc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount available for repurchase under a share repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	grc_
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Balance Type:	credit
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X

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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