STOCK-BASED COMPENSATION - Non-Employee Director Stock Compensation (Details) - Share-based Payment Arrangement, Nonemployee - USD ($)	3 Months Ended	6 Months Ended
Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Stock-based compensation
Annual award	$ 20,000
Number of shares awarded calculated based on the number of days of average price of the Company’s common stock	20 days
Number of business days based on which number of days of average price of the Company’s common stock, the number of shares awarded are calculated	2 days
Expense recognized		$ 363,000	$ 116,000
Expense recognized (in shares)		6,322	1,832
Annual award received	$ 160,000

Expense recognized for the value of the Company’s common stock received by non-employee directors in shares.

No definition available.

Name:	cto_DeferredCompensationArrangementWithIndividualCompensationExpenseShares
Namespace Prefix:	cto_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of business days based on which number of days of average price of the Company’s common stock, the number of shares awarded are calculated.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of shares awarded calculated based on the number of days of average price of the Company’s common stock.

+ References

No definition available.

+ Details

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

- Definition

Amount of commitment made to pay deferred cash remuneration.

+ References

No definition available.

+ Details

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

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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

- Definition

Amount of distribution made to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_GranteeStatusAxis=us-gaap_ShareBasedPaymentArrangementNonemployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: