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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:    
Net loss $ (1,512,000)us-gaap_ProfitLoss $ (7,476,000)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 2,458,000us-gaap_DepreciationDepletionAndAmortization 2,468,000us-gaap_DepreciationDepletionAndAmortization
Loss on extinguishment of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 3,910,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Loss on disposal of assets 51,000us-gaap_GainLossOnDispositionOfAssets1 1,092,000us-gaap_GainLossOnDispositionOfAssets1
Gain on sale of real estate (1,742,000)us-gaap_GainsLossesOnSalesOfOtherRealEstate 0us-gaap_GainsLossesOnSalesOfOtherRealEstate
Gain on insurance recovery 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities (249,000)us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Net unrealized loss (gain) on marketable securities 3,106,000us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss (629,000)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Unrealized loss on other investments 26,000intg_UnrealizedGainLossOnOtherInvestmentsAndDerivativeInstruments 6,000intg_UnrealizedGainLossOnOtherInvestmentsAndDerivativeInstruments
Stock compensation expense 552,000us-gaap_ShareBasedCompensation 191,000us-gaap_ShareBasedCompensation
Changes in assets and liabilities:    
Investment in marketable securities (3,612,000)us-gaap_IncreaseDecreaseInTradingSecurities 154,000us-gaap_IncreaseDecreaseInTradingSecurities
Other assets 12,000us-gaap_IncreaseDecreaseInOtherOperatingAssets (1,545,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and other liabilities (3,765,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 4,918,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Due to securities broker 1,954,000intg_IncreaseDecreaseInDueToSecuritiesBroker (345,000)intg_IncreaseDecreaseInDueToSecuritiesBroker
Obligations for securities sold 397,000intg_IncreaseDecreaseInObligationsForSecuritiesSold (208,000)intg_IncreaseDecreaseInObligationsForSecuritiesSold
Deferred taxes (258,000)us-gaap_DeferredIncomeTaxExpenseBenefit (2,017,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Net cash (used in) provided by operating activities (2,333,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 270,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Net proceeds from sale of real estate 3,288,000us-gaap_ProceedsFromSaleOfOtherRealEstateHeldforinvestment 0us-gaap_ProceedsFromSaleOfOtherRealEstateHeldforinvestment
Investment in hotel (2,916,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,592,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Investment in real estate (331,000)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment (142,000)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment
Investment in Santa Fe (68,000)intg_PaymentsToAcquireInterestInSubsidiaries 0intg_PaymentsToAcquireInterestInSubsidiaries
Investment in Portsmouth (33,000)intg_PaymentsToAcquireInterestInAffiliates 0intg_PaymentsToAcquireInterestInAffiliates
Net cash used in investing activities (60,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,734,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Restricted cash - withdrawal of (payments to) mortgage impounds 360,000us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities (1,011,000)us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities
Redemption payments 0intg_RedemptionPayments (64,152,000)intg_RedemptionPayments
Borrowings from mortgage and other notes payable, net 426,000us-gaap_ProceedsFromOtherDebt 68,969,000us-gaap_ProceedsFromOtherDebt
Payments to mortgage and other notes payable (1,889,000)us-gaap_RepaymentsOfOtherDebt (865,000)us-gaap_RepaymentsOfOtherDebt
Purchase of treasury stock (56,000)us-gaap_PaymentsForRepurchaseOfCommonStock (5,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) provided by financing activities (1,159,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 2,936,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) increase in cash and cash equivalents (3,552,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,472,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the period 4,705,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,453,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the period 1,153,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,925,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental information:    
Interest paid $ 5,471,000us-gaap_InterestPaid $ 3,622,000us-gaap_InterestPaid