The percentage of collateral as defined in the debt agreement.

No definition available.

Name:	ictsf_DebtInstrumentPercentageOfCollateral
Namespace Prefix:	ictsf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of the borrowing base that cannot be exceeded as defined in the credit agreement.

+ References

No definition available.

+ Details

Name:	ictsf_LineOfCreditFacilityPercentageOfBorrowingBase
Namespace Prefix:	ictsf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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(16))
-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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Definition

Amounts due from owners or affiliates of the reporting entity related to issuance of the entity's capital stock before cash payment is received (does not include amounts due from officers or directors). This element would also include the receivable for proceeds from the issuance of shares under employee stock option exercises which proceeds have not been received as of the reporting date due to the timing of the transaction date versus the settlement date.

+ References

Reference 1: 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.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_EUR
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Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_GuaranteeTypeOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_MajorityShareholderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=ictsf_LineOfCreditOneMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
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- Details

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- Details

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- Details

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Data Type:	na
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- Details

Name:	us-gaap_CreditFacilityAxis=ictsf_LineOfCreditTwoMember
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- Details

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- Details

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Name:	us-gaap_CreditFacilityAxis=ictsf_LineOfCreditFourMember
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NOTES PAYABLE - BANKS (Details) € in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 EUR (€)	Jan. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jan. 31, 2016 EUR (€)
Financial Guarantee [Member]
Line of credit, maximum borrowing amount	$ 2,850
Financial Guarantee [Member] \| Euro Member Countries, Euro
Line of credit, maximum borrowing amount \| €				€ 2,500
Outstanding Guarantee [Member]
Line of credit, amount outstanding	2,790
Outstanding Guarantee [Member] \| Euro Member Countries, Euro
Line of credit, amount outstanding \| €			€ 2,448
Letter of Credit [Member]
Line of credit, maximum borrowing amount	$ 1,000
Line of credit, maximum percentage of borrowing base	95.00%		95.00%
Letter of Credit [Member] \| Subsequent Event [Member]
Line of credit, maximum borrowing amount		$ 700
Letter of Credit [Member] \| Subsequent Event [Member] \| Majority Shareholder [Member]
Due from shareholders		$ 700
Line of Credit One [Member]
Line of credit, maximum borrowing amount							$ 8,500	$ 6,500
Line of credit, amount outstanding	$ 6,217				$ 6,301
Line of credit, unused borrowing capacity	$ 531				$ 833
Credit facility, expiration date	Jun. 24, 2018
Line of Credit One [Member] \| LIBOR [Member]
Debt instrument, basis spread	4.25%
Effective interest rate	5.625%		5.625%
Line of Credit One [Member] \| LIBOR [Member] \| Minimum [Member]
Debt instrument, basis spread	1.375%
Line of Credit One [Member] \| Accounts Receivable [Member]
Percentage of collateral	85.00%		85.00%
Line of Credit One [Member] \| Unbilled Receivables [Member]
Percentage of collateral	75.00%		75.00%
Line of Credit Two [Member]
Line of credit, maximum borrowing amount	$ 11,398
Debt instrument, basis spread	80.00%
Line of credit, amount outstanding	$ 9,840
Line of credit, unused line fee	0.75%
Line of Credit Two [Member] \| Credit Line Increase [Member]
Line of credit, maximum borrowing amount	$ 13,676
Line of Credit Two [Member] \| Euro Member Countries, Euro
Line of credit, maximum borrowing amount \| €						€ 12,000			€ 10,000
Line of credit, amount outstanding \| €			€ 8,633
Line of Credit Two [Member] \| EURIBOR [Member]
Debt instrument, basis spread	3.75%
Effective interest rate	3.50%		3.50%
Line of Credit Two [Member] \| EURIBOR [Member] \| Minimum [Member]
Effective interest rate	3.50%		3.50%
Line of Credit Four [Member]
Line of credit, maximum borrowing amount	$ 1,000
Line of credit, maximum percentage of borrowing base	95.00%		95.00%