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Cash, Cash Equivalents and Restricted Cash (Details Narrative)	Dec. 31, 2020 USD ($)
Restricted Cash and Cash Equivalents [Abstract]
key money	$ 0

X

- Definition

key money.

+ References

No definition available.

+ Details

Name:	INTG_KeyMoney
Namespace Prefix:	INTG_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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