Note 7 - Segment, Significant Customers and Geographic Information - Revenue by Product Family (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue	$ 293,317	$ 186,209	$ 547,772	$ 351,987
DC To DC Products [Member]
Revenue	278,808	176,113	520,237	332,988
Lighting Control Products [Member]
Revenue	$ 14,509	$ 10,096	$ 27,535	$ 18,999

Amount, excluding 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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+ Details