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Note 6 - Line of Credit (Details Textual) - Silicon Valley Bank [Member] - USD ($) $ in Thousands | Jun. 23, 2015 | Jun. 30, 2008 | Mar. 29, 2006
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Credit Line, 2006 [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 1,000
Credit Line, 2008 [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,500 |
Line of Credit [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 625 |  |

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- 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 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=intz_CreditLine2006Member
Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=intz_SiliconValleyBankMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=intz_CreditLine2008Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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