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Note 1 - Organization and Significant Accounting Policies - Purchase Price Allocation for Hillcrest Labs Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Aug. 31, 2019	Jul. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible assets		$ 7,063
Goodwill	$ 51,070			$ 46,612	$ 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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