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Note 13 - Equity Incentive Plan - Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based compensation expense	$ 6,087	$ 11,046	$ 5,807
Cost of Sales [Member]
Stock-based compensation expense	412	(160)	439
Research and Development Expense [Member]
Stock-based compensation expense	424	851	564
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	$ 5,251	$ 10,355	$ 4,804

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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