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Note 1 - Organization and Significant Accounting Policies - Purchase Price Allocation for Hillcrest Labs Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2019	Jul. 19, 2019	Dec. 31, 2018
Intangible assets			$ 7,063
Goodwill	$ 51,070	$ 51,070			$ 46,612
Total assets			$ 10,000
Acquisition of Hillcrest Labs [Member]
Tangible assets (including inventory, property and equipment and other)				$ 681
Goodwill				4,458
Total assets				11,204
Acquisition of Hillcrest Labs [Member] | Developed Technology Rights [Member]
Intangible assets				2,475
Acquisition of Hillcrest Labs [Member] | Customer Relationships [Member]
Intangible assets				3,518
Acquisition of Hillcrest Labs [Member] | Customer Backlog [Member]
Intangible assets				$ 72

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Amount of tangible assets (assets excluding intangible assets) acquired at the acquisition date.

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