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Note 6 - Leases (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Lessee, Operating Lease, Renewal Term | 5 years |
Lessee, Leases, Option to Terminate, Period | 1 year |
Commercial and Industrial Building in Lenexa, Kansas [Member] |  |
Lessee, Operating Lease, Term of Contract |  | 20 years
Minimum [Member] |  |
Lessee, Remaining Lease Term | 1 year |
Maximum [Member] |  |
Lessee, Remaining Lease Term | 5 years |

X
- Definition Period of option to terminate on leases of the lessee. + References No definition available. + Details
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Namespace Prefix: | grc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining term for lessee's leases. + References No definition available. + Details
Name: | grc_LesseeRemainingLeaseTerm
Namespace Prefix: | grc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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