Note 11 - Segment and Related Information - Information by Industry Segment (Details) - USD ($)		3 Months Ended		9 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sales		$ 7,220,626	$ 1,530,244	$ 12,923,867	$ 3,953,740
Income (Loss) Before Provision for Income Taxes
Commercial Air Handling		978,896	(8,095)	894,458	(519,728)
Operating Segments [Member] | Commercial Air Handling [Member]
Sales		3,343,945		3,343,945
Income (Loss) Before Provision for Income Taxes
Commercial Air Handling		607,471		607,471
Operating Segments [Member] | Test and Measurement [Member]
Sales		2,452,854	1,530,244	5,049,991	3,953,740
Income (Loss) Before Provision for Income Taxes
Commercial Air Handling	[1]	880,600	(8,095)	(19,446)	(519,728)
Operating Segments [Member] | Industrial Hose [Member]
Sales		1,423,827		4,529,931
Income (Loss) Before Provision for Income Taxes
Commercial Air Handling		$ (509,175)		$ 306,433

[1] Certain Expenses such as corporate general and administrative expenses, acquisition related expense and interest expense are included in the Test and Measurement division.