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Note 5 - Employee Benefit Plan (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan, Minimum age Required for Contribution of Additional Amount of Salary Per Year | 50 years |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 0.25% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 4.00% |
Defined Contribution Plan, Cost Recognized | $ 32,000 | $ 31,000
Minimum [Member] |  |
Define Contribution Plan, Percentage of Contribution by Employees | 1.00% |
Maximum [Member] |  |
Define Contribution Plan, Percentage of Contribution by Employees | 25.00% |

X
- Definition Represents the percentage of annual compensation of employee for which employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | intz_DefineContributionPlanPercentageOfContributionByEmployees
Namespace Prefix: | intz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum age required for contribution of an additional amount of salary per year by participants. + References No definition available. + Details
Name: | intz_DefinedContributionPlanMinimumAgeRequiredForContributionOfAdditionalAmountOfSalaryPerYear
Namespace Prefix: | intz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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