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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Dec. 03, 2019	Dec. 31, 2019	Mar. 31, 2020
Goodwill, Ending Balance		$ 21,993	$ 22,219
Business Combination, Acquisition Related Costs			200
CUI Power [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 32,000
Majority Products Business of CUI Power [Member]
Payments to Acquire Businesses, Gross	$ 29,200
Goodwill, Ending Balance	$ 10,900
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			8,200
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 900

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-SubTopic 10
-Section 25
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X

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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