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Note 4 - Commitments and Contingencies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Operating Leases | 2 |
Operating Leases, Rent Expense, Net | $ 415,000 | $ 384,000
Minimum [Member] |  |
Lessor Leasing Arrangements, Operating Leases, Renewal Term | 1 year |
Maximum [Member] |  |
Lessor Leasing Arrangements, Operating Leases, Renewal Term | 2 years |

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- Definition Represents the number of operating leases. + References No definition available. + Details
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Namespace Prefix: | intz_
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Balance Type: | na
Period Type: | duration

X
- Definition Term of the lessor's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: |
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- Details
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Period Type: |