Note 13 - Segment and Related Information - Information By Industry Segment (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Revenue	$ 6,645,780	$ 5,852,924	$ 6,305,836
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	1,333,248	(122,377)	8,376
Corporate, Non-Segment [Member]
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	1,024,152	(1,062,393)	(1,008,743)
Indicators and Gauges [Member] | Operating Segments [Member]
Revenue	1,196,204	1,298,901	1,492,348
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	161,878	260,296	312,692
Automotive Diagnostic Tools and Equipment [Member] | Operating Segments [Member]
Revenue	3,688,574	4,554,023	4,813,488
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	(18,857)	679,720	704,427
Flexible Metal Hose and Silicone Hose [Member] | Operating Segments [Member]
Revenue	1,761,002
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	$ 166,075