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Note 15 - Stock-based Compensation - Summary of the Status of the 2012 Incentive Plan (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Outstanding at beginning of year (in shares) |  | 2,565 |  |
Outstanding at end of year (in shares) |  | 1,548 | 2,565 |
2012 Incentive Plan [Member] |  |  |  |
Outstanding at beginning of year (in shares) |  | 2,565 | 2,438 | 4,477
Outstanding at beginning of year (in dollars per share) |  | $ 33.36 | $ 25.38 | $ 27.48
Stock Options (in shares) |  | 30 | 1,155 | 45
Stock Options (in dollars per share) |  | $ 57.97 | $ 43.01 | $ 38.24
Exercised (in shares) |  | (1,181) | (967) | (1,589)
Exercised (in dollars per share) |  | $ 25.92 | $ 25.33 | $ 26.77
Forfeited (in shares) |  | (21) | (57) | (125)
Forfeited (in dollars per share) |  | $ 46.15 | $ 24.12 | $ 27.33
Expired (in shares) |  |  | (4) | (370)
Expired (in dollars per share) |  |  | $ 26.84 | $ 45.78
Outstanding at end of year (in shares) |  | 1,548 | 2,565 | 2,438
Outstanding at end of year (in dollars per share) |  | $ 41.35 | $ 33.36 | $ 25.38
Options and SARs exercisable at end of year (in shares) |  | 431 | 557 | 858
Options and SARs exercisable at end of year (in dollars per share) |  | $ 32.61 | $ 25.22 | $ 26.75
Weighted-average fair value of options and SARs granted during the year (in dollars per share) |  | $ 22.82 | $ 11.61 | $ 8.68
2012 Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |
Other than Options (in shares) | [1] | 132 |  |
Other than Options (in dollars per share) | [1] | $ 62.55 |  |
2012 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Other than Options (in shares) | [2] | 23 |  |
Other than Options (in dollars per share) | [2] |  |  |
[1] | Upon exercise, SARs entitle the recipient to receive shares of common stock with a value equal to the increase in value of the award between the grant date and the exercise date.
[2] | An RSU represents the right to receive one share of common stock once certain vesting conditions are met. The value of an RSU is identical to the value of the underlying stock.

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options and stock appreciation rights outstanding and currently exercisable under the stock option plan. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grants the fair value of options and stock appreciation rights. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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