OTHER ASSETS, NET (Details Textual) - USD ($)	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Amortization Expense Of Loan fees And Franchise Costs	$ 159,000	$ 131,000

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of loan fees and franchise costs over their estimated remaining economic lives.

No definition available.

Name:	intg_AmortizationExpenseOfLoanFeesAndFranchiseCosts
Namespace Prefix:	intg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration