Note 12 - Segment and Related Information (Details) - Revenue information by industry segment: (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Net Sales
Net Sales	$ 6,466,172	$ 4,761,289	$ 5,068,613
Income (Loss) Before Provision for Income Taxes
Income (Loss) Before Provision for Income Taxes	138,805	(783,966)	(672,535)
Indicators and Gauges [Member]
Net Sales
Net Sales	1,657,725	1,612,943	1,253,975
Income (Loss) Before Provision for Income Taxes
Income (Loss) Before Provision for Income Taxes	433,361	271,343	94,178
Automotive Diagnostic Tools and Equipment [Member]
Net Sales
Net Sales	4,808,447	3,148,346	3,814,638
Income (Loss) Before Provision for Income Taxes
Income (Loss) Before Provision for Income Taxes	834,630	(78,433)	229,355
General Corporate Expenses [Member]
Income (Loss) Before Provision for Income Taxes
Income (Loss) Before Provision for Income Taxes	$ (1,129,186)	$ (976,876)	$ (996,068)