Represents information pertaining to reduction standard corporate income taxr rate.

No definition available.

Name:	fcre_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential1
Namespace Prefix:	fcre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

+ References

No definition available.

+ Details

Name:	fcre_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialDesciption
Namespace Prefix:	fcre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Expiration year of each operating loss carryforward included in operating loss carryforward, in CCYY format.

+ References

No definition available.

+ Details

Name:	fcre_OperatingLossCarryforwardsExpirationYear
Namespace Prefix:	fcre_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents as a percentage of valuation allowance during period.

+ References

No definition available.

+ Details

Name:	fcre_PercentageOfValuationAllowance
Namespace Prefix:	fcre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revaluation of deferred tax assets and labilities.

+ References

No definition available.

+ Details

Name:	fcre_RevaluationOfDeferredTaxAssetsAndLiabilities
Namespace Prefix:	fcre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

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

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

+ Details

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

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_OperatingLossCarryforwardsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_IsraelTaxAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_HerMajestysRevenueAndCustomsHMRCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=fcre_FederalJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Income Taxes (Details Narrative) - USD ($) $ in Thousands					12 Months Ended
Income Taxes (Details Narrative) - USD ($) $ in Thousands	Jan. 04, 2017	Apr. 01, 2015	Apr. 01, 2014	Mar. 31, 2014	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Income tax rate					34.00%	34.00%
Revaluation of deferred tax assets and liabilities					$ 17,300
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Income tax rate					21.00%
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Income tax rate					35.00%
Foreign Tax Authority [Member] \| Israel Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Standard corporate income tax rate	25.00%
Reduction in standard corporate income tax rate	1.50%
Foreign Tax Authority [Member] \| Israel Tax Authority [Member] \| Minimum [Member]
Operating Loss Carryforwards [Line Items]
Standard corporate income tax rate						25.00%
Foreign Tax Authority [Member] \| Israel Tax Authority [Member] \| Maximum [Member]
Operating Loss Carryforwards [Line Items]
Standard corporate income tax rate						26.50%
Foreign Tax Authority [Member] \| Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards [Line Items]
Standard corporate income tax rate		20.00%	21.00%	23.00%
Description of standard corporate income tax rate						The rate further reduced to 19% effective April 1, 2017.
Foreign Tax Authority [Member] \| Her Majesty's Revenue and Customs (HMRC) [Member] \| Photo Therapeutics Limited [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards					$ 12,800
Percentage of valuation allowance					100.00%
Federal Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards					$ 12,500
Federal Jurisdiction [Member] \| Internal Revenue Service (IRS) [Member] \| Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expiration year					2022
Federal Jurisdiction [Member] \| Internal Revenue Service (IRS) [Member] \| Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expiration year					2037