Note 8 - Segment and Related Information - Information by Industry Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Sales	$ 3,346,315	$ 1,046,624	$ 5,703,241	$ 2,423,496
Income (Loss) Before Provision for Income Taxes
Test and Measurement	221,267	(464,444)	(84,439)	(511,633)
Operating Segments [Member] | Test and Measurement [Member]
Sales	1,770,071	1,046,624	2,597,137	2,423,496
Income (Loss) Before Provision for Income Taxes
Test and Measurement	734,228	79,370	688,818	468,948
Operating Segments [Member] | Industrial Hose [Member]
Sales	1,576,244		3,106,104
Income (Loss) Before Provision for Income Taxes
Test and Measurement	425,970		815,607
Corporate, Non-Segment [Member]
Income (Loss) Before Provision for Income Taxes
Test and Measurement	$ (938,931)	$ (543,814)	$ (1,588,864)	$ (980,581)