Area of property sold.

No definition available.

Name:	tci_AreaOfPropertySold
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

Amount of mortgage note payable.

+ References

No definition available.

+ Details

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

- Definition

Number of units sold.

+ References

No definition available.

+ Details

Name:	tci_NumberOfUnitsSold
Namespace Prefix:	tci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

+ Details

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

- Definition

The cash outflow used to purchase loans that are secured with real estate mortgage and are held with the intention to resell in the near future.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3461-108585

+ Details

Name:	us-gaap_PaymentsToPurchaseMortgageLoansHeldForSale
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:	srt_StatementGeographicalAxis=tci_PortArthurMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

Real Estate Activity (Details Narrative) $ in Thousands				9 Months Ended
Real Estate Activity (Details Narrative) $ in Thousands	Sep. 14, 2020 USD ($) ft²	Jul. 16, 2020 USD ($) Number	May 01, 2020 USD ($) Number	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Gain on sale				$ 21,802	$ 9,409
Port Arthur [Member]
Number of units sold \| Number		144
Proceeds from sale		$ 13,300
Gain on sale		2,684
Mortgage note payable		9,085
Cash payment		$ 4,215
Villager Apartments [Member]
Number of units sold \| Number			33
Proceeds from sale			$ 2,426
Gain on sale			898
Mortgage note payable			665
Note receivable and the assumption			$ 1,761
Bridgeview Plaza [Member]
Area of property sold \| ft²	122,205
Proceeds from sale	$ 5,250
Gain on sale	4,744
Mortgage note payable	$ 3,375