The number of income properties pledged to secure a debt instrument.

No definition available.

Name:	cto_DebtInstrumentCollateralNumberOfIncomeProperties
Namespace Prefix:	cto_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time used as the basis of an amortization schedule for repayment of principal, when required, on debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	cto_DebtInstrumentPeriodOfAmortizationScheduleForPrincipalPayments
Namespace Prefix:	cto_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and when debt instrument is pre-payable, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	cto_DebtInstrumentPeriodToWhenLoanCanBePrepaid
Namespace Prefix:	cto_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and end of fixed interest rate on debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	cto_DebtInstrumentTermOfFixedInterestRate
Namespace Prefix:	cto_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and end of interest only payments on debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	cto_DebtInstrumentTermOfInterestOnlyPayments
Namespace Prefix:	cto_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period after effective date of the loan that cash flows, as defined in the related loan agreement, generated by the underlying income properties must be used to pay down the principal balance of loan.

+ References

No definition available.

+ Details

Name:	cto_PeriodAfterWhichIncomePropertyCashFlowsMustBeUsedToPayDownPrincipalBalance
Namespace Prefix:	cto_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_LongTermDebtTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cto_BankOfMontrealCreditAgreementAsAmendedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- 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:	us-gaap_DebtInstrumentAxis=cto_WellsFargoFirstMortgageLoan30September2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cto_WellsFargoFirstMortgageLoan15April2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cto_ConvertibleSeniorNotes3.875PercentDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT - Outstanding Indebtedness (Details)	9 Months Ended
LONG-TERM DEBT - Outstanding Indebtedness (Details)	Sep. 30, 2020 USD ($) property	Aug. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 19, 2020 USD ($)	Feb. 04, 2020 USD ($)	Apr. 30, 2016 USD ($)
Long-term debt
Face Value of Debt	$ 284,675,779					$ 25,000,000.0
Derivatives fixed interest	$ 2,294,193	$ 50,000,000.0	$ 100,000,000.0
Interest Rate Swap
Long-term debt
Interest rate (as a percent)		0.22%	0.7325%
Fixed interest rate through use of derivative (as a percent)	3.17%
Derivatives fixed interest		$ 50,000,000.0
Credit Facility
Long-term debt
Face Value of Debt	$ 168,845,349
Credit Facility \| Interest Rate Swap
Long-term debt
Face Value of Debt		$ 50,000,000.0	$ 100,000,000.0
Fixed interest rate through use of derivative (as a percent)		0.22%	0.7325%	0.7325%
Derivatives fixed interest				$ 100,000,000.0
Credit Facility \| LIBOR \| Minimum
Long-term debt
Margin added to variable rate basis (as a percent)	1.35%
Credit Facility \| LIBOR \| Maximum
Long-term debt
Margin added to variable rate basis (as a percent)	1.95%
Wells Fargo Mortgage Note Payable Originated September 30, 2014
Long-term debt
Face Value of Debt	$ 30,000,000
Interest rate (as a percent)	4.33%
Number of income properties securing debt \| property	6
Period of fixed interest rate	10 years
Period of interest only payments	10 years
Period after which cash flows generated by underlying income properties must be used to pay down principal balance	10 years
Period to when loan is pre-payable	10 years
Wells Fargo Mortgage Note Payable Originated April 15, 2016
Long-term debt
Face Value of Debt	$ 23,362,430
Interest rate (as a percent)	3.17%
Term of loan	5 years
Period of interest only payments	2 years
Period of amortization for principal payments	25 years
Wells Fargo Mortgage Note Payable Originated April 15, 2016 \| LIBOR
Long-term debt
Margin added to variable rate basis (as a percent)	1.90%
3.875% Convertible Senior Notes due 2025
Long-term debt
Face Value of Debt	$ 62,468,000				$ 17,600,000
Interest rate (as a percent)	3.875%				3.875%