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Note 7 - Concentrations (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Number of Areas in Which Operations are Concentrated			1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | U.S. Government [Member]
Concentration Risk, Percentage	72.20%	66.20%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Government Customers [Member]
Concentration Risk, Percentage	54.20%	54.40%
Number of Major Customers	3	3
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Commercial Customers [Member]
Concentration Risk, Percentage	25.90%	30.30%
Number of Major Customers	1	1

X

- Definition

Represents the number of areas in which operations of the entity are concentrated.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of major customers of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	intz_
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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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- Details

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- Details

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X

- Details

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Period Type:

X

- Details

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X

- Details

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