Note 9 - Information by Industry Segment (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Net Sales
Revenue	$ 1,091,182	$ 1,116,467	$ 2,253,400	$ 2,166,709
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	(276,663)	(297,655)	(547,319)	(617,942)
Asset Information
Assets	3,100,294	3,064,199	3,100,294	3,064,199
Revenue:
Revenue	1,091,182	1,116,467	2,253,400	2,166,709
Indicators and Gauges [Member]
Net Sales
Revenue	355,267	346,196	600,936	750,601
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	62,103	23,770	64,596	89,404
Asset Information
Assets	794,095	848,878	794,095	848,878
Revenue:
Revenue	355,267	346,196	600,936	750,601
Automotive Diagnostic Tools and Equipment [Member]
Net Sales
Revenue	735,915	770,271	1,652,464	1,416,108
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	(91,159)	(14,140)	(122,547)	(101,210)
Asset Information
Assets	1,575,734	1,622,450	1,575,734	1,622,450
Revenue:
Revenue	735,915	770,271	1,652,464	1,416,108
Corporate Segment [Member]
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	(247,607)	(307,285)	(489,368)	(606,136)
Asset Information
Assets	730,465	592,871	730,465	592,871
UNITED STATES
Net Sales
Revenue	1,068,123	1,094,458	2,195,582	2,098,606
Revenue:
Revenue	1,068,123	1,094,458	2,195,582	2,098,606
AUSTRALIA
Net Sales
Revenue	3,675		11,800	24,138
Revenue:
Revenue	3,675		11,800	24,138
CANADA
Net Sales
Revenue	15,896	10,222	35,554	21,714
Revenue:
Revenue	15,896	10,222	35,554	21,714
MEXICO
Net Sales
Revenue	3,488	7,848	10,464	18,312
Revenue:
Revenue	3,488	7,848	10,464	18,312
Other Foreign Countries [Member]
Net Sales
Revenue		3,939		3,939
Revenue:
Revenue		$ 3,939		$ 3,939