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Note 11 - Equity-based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Outstanding, stock appreciation rights (in shares) | 102,458 |
Outstanding, weighted average exercise price (in dollars per share) | $ 477.62 |
Outstanding, beginning balance, weighted average fair value (in dollars per share) | $ 100.91 |
Outstanding, aggregate intrinsic value | $ 18,116 | $ 23,173
Weighted average remaining contractual term, outstanding (Year) | 8 years 36 days | 8 years 36 days
Granted, stock appreciation rights (in shares) | 12,500 |
Granted, weighted average exercise price (in dollars per share) | $ 707.17 |
Granted, weighted average fair value (in dollars per share) | $ 169.54 |
Weighted average remaining contractual term, granted (Year) | 9 years 292 days |
Exercised, stock appreciation rights (in shares) | 11,157 |
Exercised, weighted average exercise price (in dollars per share) | $ 432.23 |
Exercised, weighted average fair value (in dollars per share) | $ 89.73 |
Forfeited, stock appreciation rights (in shares) | (2,249) |
Forfeited, weighted average exercise price (in dollars per share) | $ 422.31 |
Forfeited, weighted average fair value (in dollars per share) | $ 87.22 |
Outstanding, stock appreciation rights (in shares) | 101,552 | 102,458
Outstanding, weighted average exercise price (in dollars per share) | $ 512.09 | $ 477.62
Outstanding, beginning balance, weighted average fair value (in dollars per share) | $ 110.89 | $ 100.91
Vested and exercisable, stock appreciation rights (in shares) | 15,795 |
Vested and exercisable, weighted average exercise price (in dollars per share) | $ 482.94 |
Vested and exercisable, weighted average fair value (in dollars per share) | $ 102.51 |
Vested and exercisable, aggregate intrinsic value | $ 3,225 |
Weighted average remaining contractual term, vested and exercisable (Year) | 7 years 292 days |

X
- Definition Intrinsic value of equity-based compensation awards vested and exercisable. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of exercises 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 No definition available. + Details
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- Definition Weighted average per share amount at which exercisors can acquire shares of common stock by exercise of other than stock (or unit) options (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition The weighted average fair value for equity-based awards exercised 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 No definition available. + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options granted during the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + References No definition available. + Details
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- Definition The weighted average fair value of outstanding awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares vested and exercisable under the equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + References No definition available. + Details
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- Definition The weighted average fair value of vested and exercisable awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + References No definition available. + Details
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- Definition Weighted average remaining contractual term for equity-based awards vested and exercisable, excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of equity instruments other than options vested and exercisable. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of other than stock (or unit) options (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Weighted average per share amount of forfeited share-based compensation awards. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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