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Note 9 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
2019	$ 589	$ 702
2020	486	411
2021	322	260
2022	186	124
2023	137	75
Thereafter	19	10
Total lease payments	1,739	1,582
Less: Interest	(72)
Present value of lease liabilities	$ 1,667

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease and operating lease.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments, due after fifth fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments, due in fifth fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments, due in fourth fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments, due in third fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments, due in second fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments.

+ References

No definition available.

+ Details

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