Credit facility, over advance.

No definition available.

Name:	ictsf_CreditFacilityOverAdvance
Namespace Prefix:	ictsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage of collateral as defined in the debt agreement.

+ References

No definition available.

+ Details

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

- Definition

Replacement of amount of letter of credit.

+ References

No definition available.

+ Details

Name:	ictsf_ReplacementOfAmountOfLetterOfCreditTypeMessage
Namespace Prefix:	ictsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unused line fee.

+ References

No definition available.

+ Details

Name:	ictsf_UnusedLineFee
Namespace Prefix:	ictsf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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=119400593&loc=d3e572229-122910

+ 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

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

- Definition

The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

+ 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:
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Balance Type:
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- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=ictsf_UnbilledAccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=ictsf_LineOfCreditTenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_GuaranteesMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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NOTES PAYABLE - BANKS (Details) € in Thousands, kr in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2020 USD ($)	May 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 SEK (kr)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 SEK (kr)	Oct. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount	$ 10,000	$ 10,000
Credit facility, expiration date		Oct. 30, 2021
Credit facility, amount outstanding	13,453	$ 13,453	$ 12,654				$ 17,936
Credit facility, remaining borrowing capacity			$ 17,997
Outstanding guarantees	2,596	2,596							$ 2,603
Replacement of amount of letter of credit	$ 500	$ 500
Euro Member Countries, Euro [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.50%	3.50%			3.50%	3.50%			3.50%	3.50%	3.50%			3.50%
Credit facility, amount outstanding \| €				€ 11,504	€ 12,000			€ 16,000
Credit facility, remaining borrowing capacity \| €				€ 16,361
Outstanding guarantees \| €					€ 2,316					€ 2,275
United States [Member]
Debt Instrument [Line Items]
Weighted average interest rate	6.51%	6.51%			6.51%	6.51%			6.00%	6.00%	6.00%			5.64%
Line of Credit [Member] \| Commercial Bank [Member]
Debt Instrument [Line Items]
Credit facility, expiration date		Dec. 31, 2019
Line of Credit [Member] \| United States [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount												$ 10,000
Pledged assets used to secure credit facility												$ 500
Percentage of collateral												95.00%
Debt instrument, interest rate basis points above reference rate		3.00%
Credit facility, expiration date		Oct. 31, 2021
Credit facility, amount outstanding	$ 6,475	$ 6,475							$ 9,033
Credit facility, remaining borrowing capacity	$ 3,525	3,525							967
Line of Credit [Member] \| Europe [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate basis points above reference rate	3.50%
Unused line fee	0.75%
Line of Credit [Member] \| Standby Letters of Credit [Member] \| United States [Member]
Debt Instrument [Line Items]
Pledged assets used to secure credit facility	$ 500	$ 500											$ 500	$ 700
Percentage of collateral	95.00%	95.00%			95.00%	95.00%
Line of Credit [Member] \| Standby Letters of Credit [Member] \| United States [Member] \| Shareholder [Member]
Debt Instrument [Line Items]
Pledged assets used to secure credit facility	$ 500	$ 500
Line of Credit [Member] \| Accounts Receivable [Member] \| United States [Member]
Debt Instrument [Line Items]
Percentage of collateral	85.00%	85.00%			85.00%	85.00%						85.00%
Line of Credit [Member] \| Unbilled Accounts Receivable [Member] \| United States [Member]
Debt Instrument [Line Items]
Percentage of collateral	80.00%	80.00%			80.00%	80.00%						80.00%
Line Of Credit Two [Member] \| United States [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate	4.76%	4.76%			4.76%	4.76%
Line of Credit Line [Member] \| Europe [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate basis points above reference rate		3.50%
Line of Credit Europe [Member] \| Europe [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount	$ 13,453	$ 13,453
Credit facility, amount outstanding	13,313	13,313							2,525
Line of Credit Europe [Member] \| Europe [Member] \| Euro Member Countries, Euro [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount \| €					€ 12,000
Line of Credit Europe [Member] \| Sweden [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount	$ 215	$ 215
Debt instrument, effective interest rate	2.80%	2.80%			2.80%	2.80%
Credit facility, amount outstanding									331
Credit facility, over advance									107
Line of Credit Europe [Member] \| Sweden [Member] \| Sweden, Kronor
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount \| kr						kr 2,000
Line of Credit Ten [Member] \| Europe [Member] \| Euro Member Countries, Euro [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding \| €					€ 11,872					€ 2,207
Line of Credit Ten [Member] \| Sweden [Member] \| Sweden, Kronor
Debt Instrument [Line Items]
Credit facility, amount outstanding \| kr						kr 1,115					kr 2,955
Credit facility, over advance \| kr											kr 955
Guarantees facility [Member] \| Shareholder [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount													$ 500	$ 700	$ 1,000
Guarantees facility [Member] \| Europe [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount	$ 2,803	$ 2,803
Outstanding guarantees	2,596	2,596							$ 2,603
Guarantees facility [Member] \| Europe [Member] \| Euro Member Countries, Euro [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing amount \| €					2,500
Outstanding guarantees \| €					€ 2,316					€ 2,275
Line of Credit Europe [Member] \| Sweden [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding	$ 120	$ 120