INVESTMENT IN UNCONSOLIDATED JOINT VENTURES AND INVESTEES (Details Narrative) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2018	Dec. 31, 2019
Minimum [Member]
Percentage of ownership		20.00%
Maximum [Member]
Percentage of ownership		50.00%
American Realty Investors, Inc. [Member]
Percentage of ownership		0.90%
Investment cost		$ 9,000
American Realty Investors, Inc. [Member] \| Series A Convertible Preferred Stock [Member]
Number of shares purchased	900,000
Value of preferred stock purchased	$ 9,000
Percent of average daily closing price for conversion	90.00%
Number of trading days	20 days
Accrued unpaid dividends	$ 9,900

The amount of accrued unpaid dividend.

No definition available.

Name:	tci_AccruedUnpaidDividends
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of trading days in computing common stock price upon conversion od convertible preferred stock.

+ References

No definition available.

+ Details

Name:	tci_NumberOfTradingDays
Namespace Prefix:	tci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of average daily closing price in calcualting the conversion of preferred stock.

+ References

No definition available.

+ Details

Name:	tci_PercentOfAverageDailyClosingPrice
Namespace Prefix:	tci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Original amount of cost-method investments at the acquisition date.

+ References

No definition available.

+ Details

Name:	us-gaap_CostMethodInvestmentsOriginalCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tci_EquityMethodInvesteeNameMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=tci_SeriesAConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: