Note 7 - Segment and Related Information - Information by Industry Segment (Details) - USD ($)	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenue	$ 2,356,926	$ 1,376,872
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	(305,706)	(47,189)
Operating Segments [Member] | Test and Measurement [Member]
Revenue	827,066	1,376,872
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	(45,409)	389,578
Operating Segments [Member] | Industrial Hose [Member]
Revenue	1,529,860
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	389,637
Corporate, Non-Segment [Member]
Income (Loss) Before Provision for Income Taxes
Income (Loss) before provision for Income Taxes	$ (649,934)	$ (436,767)