Represents the aggregate number of stock options that have been issued under the stock option plan.

No definition available.

Name:	intz_AggregateStockOptionsExercisedForThePlan
Namespace Prefix:	intz_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of separate equity incentive programs of the entity.

+ References

No definition available.

+ Details

Name:	intz_NumberOfEquityIncentivePrograms
Namespace Prefix:	intz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of stock-based compensation plans of the entity.

+ References

No definition available.

+ Details

Name:	intz_NumberOfStockbasedCompensationPlans
Namespace Prefix:	intz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the options exercisable period one.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardExercisablePeriod1
Namespace Prefix:	intz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the options exercisable period two.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardExercisablePeriod2
Namespace Prefix:	intz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the options exercisable period three.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardExercisablePeriod3
Namespace Prefix:	intz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the exercise price expressed as a percentage of the fair market value of common stock in case of optionees holding more than specified percent of voting stock of the entity.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardOfExercisePriceOfCommonStockPercentageInCaseOfOptioneesHoldingMoreThanSpecifiedPercentageOfVotingStock
Namespace Prefix:	intz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the option that will be granted to purchase shares of common stock on the date of each annual stockholders meeting, provided he or she has served as a non-employee Board member for at least six months for the entity.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionThatWillBeGrantedToPurchaseSharesOnDateOfEachAnnualStockholdersMeeting
Namespace Prefix:	intz_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate number of shares under options that have been cancelled under the stock option plan as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeituresAggregate
Namespace Prefix:	intz_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Aggregate number of share options (or share units) granted under the stock option plan.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsAggregate
Namespace Prefix:	intz_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of share options of common stock that will be granted under the stock based compensation plan upon initial election or appointment to the Board, provided that individual has not previously been employed by the entity in the preceding six months.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsThatWillBeGrantedUponInitialElectionOrAppointmentToBoard
Namespace Prefix:	intz_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period for which an individual should serve as a non-employee Board member to be granted the option to purchase shares of common stock, on the date of each annual stockholders meeting.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardPeriodForWhichIndividualShouldServeAsMemberOfNonEmployeeBoard
Namespace Prefix:	intz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the preceding period within which an individual should not be previously employed by the entity to receive an option grant for shares of common stock upon initial election or appointment to the Board.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardPrecedingPeriodWithInWhichIndividualShouldNotBeEmployed
Namespace Prefix:	intz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of voting stock to be held by optionees for entitlement to exercise price less than the specified percentage of the fair market value of common stock.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementBySharebasedPaymentAwardVotingStockPercentageToBeHeldByOptionees
Namespace Prefix:	intz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of time from the grant date until the time at which the share-based option award expires for holders of incentive stock options of more than the specified percentage of voting stock.

+ References

No definition available.

+ Details

Name:	intz_SharebasedCompensationArrangementsBySharebasedPaymentAwardOptionsExpirationTermForOptionsGrantedToHoldersOfMoreThanSpecifiedPercentageOfVotingStock
Namespace Prefix:	intz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate number of common shares reserved for future issuance.

+ 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 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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

- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=intz_The2005StockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=intz_The2015StockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=intz_NonemployeeBoardMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 9 - Stock Options (Details Textual) $ in Thousands							12 Months Ended
Note 9 - Stock Options (Details Textual) $ in Thousands	May 17, 2012 shares	May 19, 2011 shares	May 20, 2010 shares	May 21, 2009 shares	May 29, 2008 shares	May 30, 2007 shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 shares	Mar. 19, 2015 shares	Dec. 31, 2014 shares
Number of Stock-based Compensation Plans							2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number							2,254,000	2,598,000		3,076,000
Common Stock, Capital Shares Reserved for Future Issuance							3,852,609
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 1							1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 2							3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 3							5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period							10 years
Share-based Compensation Arrangements By Share-based Payment Award, Options Expiration Term For Options Granted To Holders Of More Than Specified Percentage Of Voting Stock							5 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options \| $							$ 37
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition							306 days
Maximum [Member]
Share-based Compensation Arrangement By Share-based Payment Award Of Exercise Price Of Common Stock Percentage In Case Of Optionees Holding More Than Specified Percentage Of Voting Stock							110.00%
Minimum [Member]
Share-based Compensation Arrangement By Share-based Payment Award Voting Stock Percentage To Be Held By Optionees							10.00%
The 2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,700,000	3,400,000	3,000,000	2,500,000		1,500,000	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	300,000	400,000	500,000	500,000	500,000	750,000
Aggregate Stock Options Exercised for the Plan								768,835
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number								2,185,167
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants Aggregate								3,892,000
Share-based Compensation Arrangement by Share-based Payment Award, Options Forfeitures Aggregate								937,998
Common Stock, Capital Shares Reserved for Future Issuance							2,185,000
The 2015 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							531,000		600,000
Aggregate Stock Options Exercised for the Plan							0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number							69,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants Aggregate							72,000
Share-based Compensation Arrangement by Share-based Payment Award, Options Forfeitures Aggregate							3,000
Number of Equity Incentive Programs							3
Common Stock, Capital Shares Reserved for Future Issuance							600,000
Stock Issued During Period, Shares, Share-based Compensation, Gross							0
The 2015 Stock Incentive Plan [Member] \| Non-employee Board Member [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options That Will Be Granted Upon Initial Election Or Appointment to Board							10,000
Share-based Compensation Arrangement by Share-based Payment Award, Preceding Period With in Which Individual Should Not Be Employed							3 years
Share-based Compensation Arrangement by Share-based Payment Award, Option That Will Be Granted to Purchase Shares On Date of Each Annual Stockholders Meeting							8,000
Share-based Compensation Arrangement by Share-based Payment Award, Period for Which Individual Should Serve As Member of Non Employee Board							3 years