Note 9 - Segment and Related Information (Details) - Information by Industry Segment (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Net Sales
Net Sales	$ 1,116,467	$ 1,964,338	$ 2,166,709	$ 3,703,241
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	(297,655)	119,431	(617,942)	263,235
Asset Information
Asset Information	3,064,199	3,511,817	3,064,199	3,511,817	3,504,683
Indicators and Gauges [Member]
Net Sales
Net Sales	346,196	417,607	750,601	827,833
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	23,770	113,216	89,404	224,840
Asset Information
Asset Information	848,878	807,464	848,878	807,464
Automotive Diagnostic Tools and Equipment [Member]
Net Sales
Net Sales	770,271	1,546,731	1,416,108	2,875,408
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	(14,140)	297,435	(101,210)	604,900
Asset Information
Asset Information	1,622,450	1,398,266	1,622,450	1,398,266
General Corporate Expenses [Member]
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	(307,285)	(291,220)	(606,136)	(566,505)
Total [Member]
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	(297,655)	119,431	(617,942)	263,235
Asset Information
Asset Information	3,064,199	3,511,817	3,064,199	3,511,817
Corporate Segment [Member]
Asset Information
Asset Information	592,871	1,306,087	592,871	1,306,087
United States [Member]
Revenue:
Geographical Information - Revenue	1,094,458	1,896,250	2,098,606	3,596,685
Australia [Member]
Revenue:
Geographical Information - Revenue		14,231	24,138	14,231
Canada [Member]
Revenue:
Geographical Information - Revenue	10,222	22,644	21,714	50,698
Mexico [Member]
Revenue:
Geographical Information - Revenue	7,848	3,488	18,312	10,536
Taiwan [Member]
Revenue:
Geographical Information - Revenue		22,481		22,481
Other Foreign Countries [Member]
Revenue:
Geographical Information - Revenue	3,939	5,244	3,939	8,610
Total [Member]
Revenue:
Geographical Information - Revenue	$ 1,116,467	$ 1,964,338	$ 2,166,709	$ 3,703,241