RELATED PARTY AND OTHER NOTES PAYABLE (Details Textual) - USD ($)	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	May 05, 2016
Increase (Decrease) in Notes Payable, Related Parties	$ 316,000	$ 316,000
Key Money Incentive Advance To Related Party	$ 2,000,000
Management Services Agreement Term	10 years
Notes Payable And Financing Obligations		$ 212,000
Settlement Of Evon Litigation [Member]
Loss Contingency, Accrual, Current			$ 5,575,000
Interest Free Development Incentive Note [Member]
Notes Reduction	$ 316,000

Amount of advance relating to key money incentive fee to related party.

No definition available.

Name:	intg_KeyMoneyIncentiveAdvanceToRelatedParty
Namespace Prefix:	intg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represent management services agreement term.

+ References

No definition available.

+ Details

Name:	intg_ManagementServicesAgreementTerm
Namespace Prefix:	intg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

These values are represents that notes payables and financials and obligations.

+ References

No definition available.

+ Details

Name:	intg_NotesPayableAndFinancingObligations
Namespace Prefix:	intg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The increase (decrease) during the reporting period in the amount owed by the reporting entry in the form of loans and obligations (generally evidenced by promissory notes) made by the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

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

- Definition

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

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

- Definition

The value of notes retired (or transferred to another entity) in noncash investing or financing transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

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

- Details

Name:	us-gaap_LitigationCaseAxis=intg_SettlementOfEvonLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=intg_InterestFreeDevelopmentIncentiveNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: