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Note 7 - Share-Based Compensation - Number of Stock Option Awards Exercisable and their Weighted Average Exercise Price (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Lower Exercise Price Range (in dollars per share)	$ 0
Upper Exercise Price Range (in dollars per share)	$ 18
Outstanding Number (in shares) | shares	17,491
Outstanding Weighted Average Remaining Life (Year)	7 years
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 6.49
Exercisable Number (in shares) | shares	8,196
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 6.16
Exercise Price Range 01 [Member]
Lower Exercise Price Range (in dollars per share)	0
Upper Exercise Price Range (in dollars per share)	$ 3
Outstanding Number (in shares) | shares	1,266
Outstanding Weighted Average Remaining Life (Year)	4 years 36 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 1.66
Exercisable Number (in shares) | shares	1,191
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 1.58
Exercise Price Range 02 [Member]
Lower Exercise Price Range (in dollars per share)	3
Upper Exercise Price Range (in dollars per share)	$ 6
Outstanding Number (in shares) | shares	7,778
Outstanding Weighted Average Remaining Life (Year)	6 years 292 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 4.69
Exercisable Number (in shares) | shares	3,937
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 4.50
Exercise Price Range 03 [Member]
Lower Exercise Price Range (in dollars per share)	6
Upper Exercise Price Range (in dollars per share)	$ 9
Outstanding Number (in shares) | shares	4,768
Outstanding Weighted Average Remaining Life (Year)	8 years 255 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 7.06
Exercisable Number (in shares) | shares	883
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 6.85
Exercise Price Range 04 [Member]
Lower Exercise Price Range (in dollars per share)	9
Upper Exercise Price Range (in dollars per share)	$ 12
Outstanding Number (in shares) | shares	2,980
Outstanding Weighted Average Remaining Life (Year)	6 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 10.90
Exercisable Number (in shares) | shares	1,711
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 10.96
Exercise Price Range 05 [Member]
Lower Exercise Price Range (in dollars per share)	12
Upper Exercise Price Range (in dollars per share)	$ 15
Outstanding Number (in shares) | shares	604
Outstanding Weighted Average Remaining Life (Year)	6 years
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 12.29
Exercisable Number (in shares) | shares	403
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 12.35
Exercise Price Range 06 [Member]
Lower Exercise Price Range (in dollars per share)	15
Upper Exercise Price Range (in dollars per share)	$ 18
Outstanding Number (in shares) | shares	95
Outstanding Weighted Average Remaining Life (Year)	6 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 15.39
Exercisable Number (in shares) | shares	71
Exercisable Weighted Average Exercise Price (in dollars per share)	$ 15.39

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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-Publisher FASB
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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-Publisher FASB
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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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