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Note 11 - Business Segment Information (Details Textual)	Dec. 31, 2020	Dec. 31, 2019
Number of Countries in which Entity Operates	130
UNITED STATES
Long Lived Assets, Percent	86.00%	87.00%

X

- Definition

The percentage of long lived assets.

+ References

No definition available.

+ Details

Name:	grc_LongLivedAssetsPercent
Namespace Prefix:	grc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: