Note 6 - Equity Incentive Plan (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Share-based Payment Arrangement, Expense	$ 1,386	$ 7,565
Stock Options, PSUs and RSUs to Employees and RSUs to Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Chief Executive Officer [Member]
Share-based Payment Arrangement, Expense		$ 6,200
RSUs Granted to Employees [Member] \| Restricted Stock Units (RSUs) [Member]
Performance Conditions, Business Target, Percentage of Performance Conditions Based on Achievement in Current Fiscal Year	30.00%
Performance Conditions, Financial Target, Percentage of Performance Conditions Based on Company’s Operating Results in next Fiscal Year	70.00%

Represents the percentage of performance conditions based on achievement in current fiscal year set as business target.

No definition available.

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- Definition

Represents the percentage of performance conditions based on company’s operating results in next fiscal year set as business target.

+ References

No definition available.

+ Details

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- Definition

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

+ 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=116856206&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=116856206&loc=d3e5070-113901

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Details

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- Details

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