Note 9 - Segment and Related Information (Detail) - Information by industry segment is set forth below: (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Net Sales
Net Sales	$ 1,738,903	$ 1,181,501
Income (Loss) before Provision for Income Taxes
Income (Loss) before Provision for Income Taxes	143,804	(183,140)
Asset Information
Asset Information	3,588,517	3,722,466	3,205,971
Indicators and Gauges [Member]
Net Sales
Net Sales	410,226	378,003
Income (Loss) before Provision for Income Taxes
Income (Loss) before Provision for Income Taxes	111,624	57,465
Asset Information
Asset Information	831,059	729,421
Automotive Diagnostic Tools and Equipment [Member]
Net Sales
Net Sales	1,328,677	803,498
Income (Loss) before Provision for Income Taxes
Income (Loss) before Provision for Income Taxes	307,465	(15,256)
Asset Information
Asset Information	2,167,252	1,667,391
General Corporate Expenses [Member]
Income (Loss) before Provision for Income Taxes
Income (Loss) before Provision for Income Taxes	(275,285)	(225,349)
Total [Member]
Income (Loss) before Provision for Income Taxes
Income (Loss) before Provision for Income Taxes	143,804	(183,140)
Asset Information
Asset Information	3,588,517	3,722,466
Corporate [Member]
Asset Information
Asset Information	590,206	1,325,654
United States [Member]
Revenue:
Geographical Information - Revenue	1,700,435	1,112,633
Australia [Member]
Revenue:
Geographical Information - Revenue		12,053
Canada [Member]
Revenue:
Geographical Information - Revenue	28,054	13,752
Taiwan [Member]
Revenue:
Geographical Information - Revenue		32,405
Other Foreign Countries [Member]
Revenue:
Geographical Information - Revenue	10,414	10,658
Total [Member]
Revenue:
Geographical Information - Revenue	$ 1,738,903	$ 1,181,501