The amount under the employee retention credit program.

No definition available.

Name:	gvp_EmployeeRetentionCredits
Namespace Prefix:	gvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of decrease on future payments in line of credit facility from forgiveness by the holder of the line of credit.

+ References

No definition available.

+ Details

Name:	gvp_LineOfCreditFacilityDecreaseForgivenessOnFuturePayments
Namespace Prefix:	gvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

As part of a covenant the Company agreed to maintain a minimum USA liquidity amount.

+ References

No definition available.

+ Details

Name:	gvp_Liquidity
Namespace Prefix:	gvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of decrease in line of credit facility from forgiveness by the holder of the line of credit.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityDecreaseForgiveness1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payment applied to principal.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gvp_TenthAmendmentAndReaffirmationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($)					9 Months Ended
Subsequent Events (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021	Nov. 12, 2021	Nov. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 29, 2016
Line of Credit Facility [Abstract]
Repayment on line of credit					$ 1,739,000	$ 694,000
Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of credit					3,500,000		$ 5,000,000.0
Repayment on line of credit					$ 1,700,000
Tenth Amendment and Reaffirmation Agreement [Member] \| Revolving Credit Facility [Member] \| Plan [Member]
Line of Credit Facility [Abstract]
Decrease forgiveness of line of credit future payments	$ 37,500
Periodic payment	$ 75,000	$ 250,000
Tenth Amendment and Reaffirmation Agreement [Member] \| Revolving Credit Facility [Member] \| Subsequent Event [Member]
Line of Credit Facility [Abstract]
Basis points			0.75%
Line of credit			$ 3,500,000
Repayment on line of credit			250,000
Decrease forgiveness of line of credit			$ 250,000
Periodic payment				$ 250,000
Liquidity				2,250,000
Amendment fee amount				15,000
Tenth Amendment and Reaffirmation Agreement [Member] \| Revolving Credit Facility [Member] \| Subsequent Event [Member] \| Maximum [Member]
Line of Credit Facility [Abstract]
Employee retention credits aggregate amount				$ 500,000