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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
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Dec. 31, 2017 $ / 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 | 14,452
Outstanding Weighted Average Remaining Life (Year) | 6 years 292 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 6.06
Exercisable Number (in shares) | shares | 7,250
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 5.69
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 | 1,724
Outstanding Weighted Average Remaining Life (Year) | 4 years 255 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 1.64
Exercisable Number (in shares) | shares | 1,598
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 1.55
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 | 8,303
Outstanding Weighted Average Remaining Life (Year) | 7 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 4.63
Exercisable Number (in shares) | shares | 3,066
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 4.31
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 | 854
Outstanding Weighted Average Remaining Life (Year) | 3 years
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 6.90
Exercisable Number (in shares) | shares | 848
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 6.89
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 | 2,857
Outstanding Weighted Average Remaining Life (Year) | 7 years 36 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 11
Exercisable Number (in shares) | shares | 1,383
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 10.98
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 | 619
Outstanding Weighted Average Remaining Life (Year) | 6 years 328 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 12.29
Exercisable Number (in shares) | shares | 308
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 12.39
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) | 7 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 15.39
Exercisable Number (in shares) | shares | 47
Exercisable Weighted Average Exercise Price (in dollars per share) | $ 15.39

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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