Area of land sold in the reporting period.

No definition available.

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

- Definition

Represents the area of land sold in the reporting period as a percentage of the total area of land holdings.

+ References

No definition available.

+ Details

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

- Definition

The number of land parcels.

+ References

No definition available.

+ Details

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

- Definition

The distance of retail land owned adjacent to a major Interstate highway.

+ References

No definition available.

+ Details

Name:	cto_RetailLandOwnedDistanceAdjacentToMajorInterstate
Namespace Prefix:	cto_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	instant

- 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

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), excluding other-than-temporary impairment (OTTI).

+ References

No definition available.

+ Details

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

- Definition

The cash outflow from the acquisition of property as primarily intended to generate income for its owner.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

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

- Details

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

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cto_UndevelopedLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_PropertyWestOfInterstate95Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_PropertyWestOfInterstate95AndNorthOfInterstate4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cto_PropertyEastOfInterstate95Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cto_UndevelopedLandParcelOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cto_UndevelopedLandGroupOfSmallerParcelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LAND AND SUBSURFACE INTERESTS - Daytona Beach, Florida Land (Details) $ in Thousands		3 Months Ended				12 Months Ended
	Aug. 01, 2018 a	Jun. 30, 2018 USD ($) a property mi	Mar. 31, 2018 USD ($) a	Jun. 30, 2017 a	Mar. 31, 2017 a	Dec. 31, 2009 USD ($)
Land and development costs and subsurface interests
Area of land sales as a percentage of land holdings	78.00%
Land sale acres	4,286			81.4	1,587.4
Net realized loss on investments \| $						$ 0
Daytona Beach, FL
Land and development costs and subsurface interests
Acres		0.9	3
Purchase price \| $		$ 1,500	$ 2,000
Undeveloped land \| Daytona Beach, FL
Land and development costs and subsurface interests
Acres		5,500
Undeveloped land \| Daytona Beach, FL \| Property west of Interstate 95
Land and development costs and subsurface interests
Acres		4,500
Distance of land owned along Interstate \| mi		6
Undeveloped land \| Daytona Beach, FL \| Property west of Interstate 95 and north of Interstate 4
Land and development costs and subsurface interests
Acres		1,000
Undeveloped land \| Daytona Beach, FL \| Property east of Interstate 95
Land and development costs and subsurface interests
Acres		1,000
Distance of land owned along Interstate \| mi		6
Undeveloped land, parcel one \| Daytona Beach, FL \| Property west of Interstate 95 and north of Interstate 4
Land and development costs and subsurface interests
Acres		850
Undeveloped land, smaller parcels \| Daytona Beach, FL \| Property west of Interstate 95 and north of Interstate 4
Land and development costs and subsurface interests
Number of land parcels \| property		3