Basis of Presentation (Details)	3 Months Ended
Mar. 31, 2013 item
Basis of Presentation
Number of instruments held for trading purposes	0

Represents the number of instruments held for trading purposes.

No definition available.

Name:	intz_NumberOfInstrumentsHeldForTradingPurposes
Namespace Prefix:	intz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration