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Note 9 - Leases - Supplement Information related to Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating lease costs	$ 127
Short-term lease costs	111
Finance lease costs	5
Total lease costs	$ 243
Operating leases (Year)	3 years
Finance lease (Year)	4 years 328 days
Operating leases	3.25%
Finance lease	3.25%

X

- Definition

Amount of interest expense on finance lease liability and amount of amortization expense attributable to right-of-use asset from finance lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	grc_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
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X

- Definition

Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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X

- Definition

Amount of lease cost recognized by lessee for lease contract.

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

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X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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X

- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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