SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND GENERAL (Stock Option Plans, Narrative) (Details) shares in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) people item roof shares	Dec. 31, 2009 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of roofs for which insurance claim filed \| roof	6
Proceeds from insurance settlements \| $	$ 744,900
Gain on settlement of insurance claim \| $	$ 476,400
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available under plan \| shares		2,400
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of options		5 years
Granted, Shares \| shares	31
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Holding Period	6 months
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards available for grant \| people	1
Number of performance measures \| item	2

Amount of gain (loss) recognized in settlement of insurance claims.

No definition available.

Name:	idsa_GainLossRelatedToInsuranceSettlement
Namespace Prefix:	idsa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of awards available for grant

+ References

No definition available.

+ Details

Name:	idsa_NumberOfAwardsAvailableForGrant
Namespace Prefix:	idsa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of performance measures.

+ References

No definition available.

+ Details

Name:	idsa_NumberOfPerformanceMeasures
Namespace Prefix:	idsa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of roofs for which insurance claim filed.

+ References

No definition available.

+ Details

Name:	idsa_NumberOfRoofsForWhichInsuranceClaimFiled
Namespace Prefix:	idsa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash received for the settlement of insurance.

+ References

No definition available.

+ Details

Name:	idsa_ProceedsFromInsuranceSettlement
Namespace Prefix:	idsa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Holding Period.

+ References

No definition available.

+ Details

Name:	idsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsHoldingPeriod
Namespace Prefix:	idsa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Term

+ References

No definition available.

+ Details

Name:	idsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumTerm
Namespace Prefix:	idsa_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: