Note 4 - Goodwill and Other Intangible Assets - Estimated Fair Values Over Carrying Value, Including Goodwill (Details) - Europe [Member]	Dec. 31, 2020	Jul. 31, 2019
% by Which Estimated Fair Value Exceeds Carrying Value		17.30%
Cinch Connectivity Solutions Segment [Member]
% by Which Estimated Fair Value Exceeds Carrying Value	51.10%
Power Solutions and Protection Segment [Member]
% by Which Estimated Fair Value Exceeds Carrying Value	21.00%
CUI Power [Member]
% by Which Estimated Fair Value Exceeds Carrying Value	38.60%