Note 12 - Segment and Related Information (Details) - Information by Industry Segment (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Net Sales
Net sales	$ 6,305,836	$ 6,466,172	$ 4,761,289
Income (Loss) Before Provision for Income Taxes
Income (loss) before provistion for income taxes	8,376	138,805	(783,966)
Indicators and Gauges [Member]
Net Sales
Net sales	1,492,348	1,657,725	1,612,943
Income (Loss) Before Provision for Income Taxes
Income (loss) before provistion for income taxes	312,692	433,361	271,343
Automotive Diagnostic Tools and Equipment [Member]
Net Sales
Net sales	4,813,488	4,808,447	3,148,346
Income (Loss) Before Provision for Income Taxes
Income (loss) before provistion for income taxes	704,427	834,630	(78,433)
Corporate, Non-Segment [Member]
Income (Loss) Before Provision for Income Taxes
Income (loss) before provistion for income taxes	(1,008,743)	(1,129,186)	(976,876)
UNITED STATES
Net Sales
Net sales	6,149,883	6,317,722	4,598,029
AUSTRALIA
Net Sales
Net sales	64,744	23,481	14,018
CANADA
Net Sales
Net sales	58,983	77,239	72,535
MEXICO
Net Sales
Net sales	25,288	16,640	36,960
TAIWAN, PROVINCE OF CHINA
Net Sales
Net sales		22,481	34,935
Other Foreign Countries [Member]
Net Sales
Net sales	$ 6,938	$ 8,609	$ 4,812