Note 4 - Goodwill and Other Intangible Assets - Estimated Fair Values Over Carrying Value, Including Goodwill (Details) - Europe [Member]	Dec. 31, 2019	Sep. 30, 2019
% by Which Estimated Fair Value Exceeds Carrying Value		17.30%
Cinch Connectivity Solutions Segment [Member]
% by Which Estimated Fair Value Exceeds Carrying Value	138.80%
Power Solutions and Protection Segment [Member]
% by Which Estimated Fair Value Exceeds Carrying Value	16.40%