Note 1 - Nature of Operations - Summary of Company's Product Classes (Details)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Product Classes (Dimensionless number)	100.00%	100.00%	100.00%
Automotive Test Equipment [Member]
Product Classes (Dimensionless number)	55.50%	77.80%	76.30%
Indicating Instruments [Member]
Product Classes (Dimensionless number)	18.00%	22.20%	23.70%
Flexible Hose [Member]
Product Classes (Dimensionless number)	26.50%