The area of land purchased during the period.

No definition available.

Name:	tci_AreaOfLandPurchased
Namespace Prefix:	tci_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

The area of land sold during the period.

+ References

No definition available.

+ Details

Name:	tci_AreaOfLandSold
Namespace Prefix:	tci_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the amount of gain (loss) on sale of land during the reporting period.

+ References

No definition available.

+ Details

Name:	tci_GainLossOnLandSales
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payments for predevelopment and construction of real estate assets is the process of adding improvements on or to a parcel of land.

+ References

No definition available.

+ Details

Name:	tci_PaymentsToConstructionAndDevelopRealEstateAssets
Namespace Prefix:	tci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireNotesReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of real estate held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireRealEstateHeldForInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tci_RelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=tci_FarmersBranchAndForneyTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=tci_FarmersBranchTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=tci_McKinneyTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=tci_DentonTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REAL ESTATE ACTIVITY (Details Narrative) $ in Thousands	3 Months Ended		6 Months Ended
REAL ESTATE ACTIVITY (Details Narrative) $ in Thousands	Jun. 30, 2020 USD ($) a	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Gain on sale of land	$ 5,339	$ 2,133	$ 9,477	$ 4,349
Purchase of note receivable			$ 1,748	$ 945
Payment for construction or predevelopment of various apartment complexes	300
Related Party [Member]
Purchase of note receivable	$ 3,600
Farmers Branch and Forney, Texas [Member]
Area of land sold \| a	25.9
Proceeds from sale of land	$ 6,600
Gain on sale of land	$ 5,300
Farmers Branch, Texas [Member]
Area of land sold \| a	0.3
Proceeds from sale of land	$ 200
Gain on sale of land	$ 60
McKinney, Texas [Member]
Area of land purchased \| a	1.3
Purchase price of properties	$ 500
Denton, Texas [Member]
Area of land purchased \| a	0.7
Purchase price of properties	$ 100