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Note 13 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allocated share-based compensation expense | $ 10,928 | $ 8,558 | $ 6,775
Cost of Sales [Member] |  |  |
Allocated share-based compensation expense | 1,543 | 970 | 691
Selling and Marketing Expense [Member] |  |  |
Allocated share-based compensation expense | 1,942 | 1,429 | 977
Research and Development Expense [Member] |  |  |
Allocated share-based compensation expense | 1,517 | 1,091 | 1,396
General and Administrative Expense [Member] |  |  |
Allocated share-based compensation expense | 5,926 | 5,068 | 3,711
Stock Options, Restricted Stock, and Other [Member] |  |  |
Allocated share-based compensation expense | 10,113 | 7,954 | 6,177
ESPP [Member] |  |  |
Allocated share-based compensation expense | $ 815 | $ 604 | $ 598

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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