Represents the area of land subject to the contractual commitment.

No definition available.

Name:	cto_ContractualObligationAreaOfLand
Namespace Prefix:	cto_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate estimated construction cost of buildings and tenant improvements.

+ References

No definition available.

+ Details

Name:	cto_EstimatedConstructionCostOfBuildingsAndTenantImprovements
Namespace Prefix:	cto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Estimated cost of improvements.

+ References

No definition available.

+ Details

Name:	cto_EstimatedCostOfImprovements
Namespace Prefix:	cto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate estimated cost of land improvements and development.

+ References

No definition available.

+ Details

Name:	cto_EstimatedCostOfLandImprovementsAndDevelopment
Namespace Prefix:	cto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The annual payments that the lessee is no longer obligated to make in connection with a property under the terms of an operating lease that has expired and was not renewed, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

+ References

No definition available.

+ Details

Name:	cto_ExpiredOperatingLeaseNotRenewedRentExpenseAnnualMinimumRentalSavings
Namespace Prefix:	cto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Area of land sold in the reporting period.

+ References

No definition available.

+ Details

Name:	cto_LandSalesAreaOfLand
Namespace Prefix:	cto_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of actual cost for reimbursement of improvement cost.

+ References

No definition available.

+ Details

Name:	cto_PercentageOfActualCostForReimbursementOfImprovementCost
Namespace Prefix:	cto_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reimbursement period of land improvement cost.

+ References

No definition available.

+ Details

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

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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

- Definition

Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

+ References

No definition available.

+ Details

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

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

- Definition

The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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

- Definition

The cash outflow from construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

+ References

+ Details

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

- Definition

The number of units (items of property) under operating lease arrangements.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cto_BeachfrontPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=cto_RestaurantPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cto_RaceTracPetroleumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cto_SamSClubAffiliateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=cto_BuyerReimbursementCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_WilliamsonCrossingSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=cto_RoadAndOtherLandImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_GroveAtWinterParkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=cto_ConstructionAndOtherCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_WestcliffPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=cto_PropertyImprovementsCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=cto_CorporateOfficeLeaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cto_IncomePropertiesBuildingsAndImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_CorporateOfficesWilliamsonBusinessParkPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COMMITMENTS AND CONTINGENCIES - Contractual Commitments - Expenditures (Details)	1 Months Ended		3 Months Ended				9 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($) a	Dec. 31, 2013 USD ($) a	Jun. 30, 2017 USD ($) a	Mar. 31, 2017 a	Sep. 30, 2016 a	Mar. 31, 2016 a	Sep. 30, 2017 USD ($) ft² a restaurant	Sep. 30, 2016 a	Dec. 31, 2013 USD ($) a	Dec. 31, 2016 USD ($) a
Commitments
Acres sold \| a			81.43	1,587.35	4.5	7.5	1,668.78	12.0
Restricted Cash							$ 7,027,196			$ 9,855,469
Beachfront property
Commitments
Acres \| a							6			6
Beachfront property \| Restaurant property
Commitments
Commitment amount							$ 4,800,000
Payments for construction in progress							$ 2,200,000
Number of properties \| restaurant							2
Total estimated cost to improve the land and develop the income properties							$ 6,900,000
Race Trac
Commitments
Acres sold \| a		3.4
Sam's Club affiliate
Commitments
Acres sold \| a	18.1
Sam's Club affiliate \| Buyer reimbursement
Commitments
Deposit of cash in escrow classified as restricted cash	$ 125,000
Restricted Cash							125,000
Williamson Crossing site
Commitments
Acres \| a		19.6							19.6
Williamson Crossing site \| Road and other land improvements
Commitments
Area of land subject to contractual commitment \| a		23
Estimated cost for improvements		$ 1,260,000
Williamson Crossing site \| Buyer reimbursement
Commitments
Percentage of cost paid		77.50%
Commitment amount		$ 976,500							$ 976,500
Reimbursement period of land improvement cost		5 years
Deposit of cash in escrow classified as restricted cash									$ 283,500
Restricted Cash							287,000
The Grove at Winter Park \| Construction commitment
Commitments
Commitment amount							315,000
Construction cost incurred							3,900,000
Estimated costs expected to be incurred related to construction of buildings and tenant improvements							4,200,000
Westcliff property
Commitments
Acres \| a			10.3
Westcliff property \| Property improvements
Commitments
Commitment amount			$ 654,000				373,000
Construction cost incurred							281,000
Lease for corporate offices
Commitments
Savings in base rent that will no longer be paid for a lease that expired							128,000
Income properties buildings and improvements \| Corporate offices, Williamson Business Park
Commitments
Construction cost incurred							$ 761,000
Area of real estate property \| ft²							7,700
Building \| Corporate offices, Williamson Business Park
Commitments
Construction cost incurred							$ 233,000
Building improvements \| Corporate offices, Williamson Business Park
Commitments
Construction cost incurred							528,000
Maximum \| Sam's Club affiliate \| Buyer reimbursement
Commitments
Commitment amount							125,000
Maximum \| Williamson Crossing site \| Buyer reimbursement
Commitments
Commitment amount							$ 689,000