Note 12 - Segment and Related Information (Detail) - Asset information by industry segment: (USD $)	Sep. 30, 2012	Sep. 30, 2011
Identifiable Assets
Segment Identifiable Assets	$ 3,205,971	$ 3,440,600
Total [Member]
Identifiable Assets
Segment Identifiable Assets	3,205,971	3,440,600
Indicators and Gauges [Member]
Identifiable Assets
Segment Identifiable Assets	850,186	701,543
Automotive Diagnostic Tools and Equipment [Member]
Identifiable Assets
Segment Identifiable Assets	1,586,634	1,980,789
Corporate [Member]
Identifiable Assets
Segment Identifiable Assets	$ 769,151	$ 758,268