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Note 11 - Equity-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Restricted |  |  | Fair Value |
|  | Stock |  |  | Per Share |
Outstanding as of December 31, 2017 |  |  | 51,290 |  |  | $ | 472.89 |
Granted |  |  | 11,039 |  |  | $ | 707.20 |
Forfeited |  |  | (818 | ) |  | $ | 595.99 |
Vested |  |  | (24,171 | ) |  | $ | 391.19 |
Outstanding as of March 31, 2018 |  |  | 37,340 |  |  | $ | 592.42 |
Vested and unissued as of March 31, 2018 |  |  | 3,185 |  |  | $ | 436.93 |
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] |
|  | Stock Appreciation Rights |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value ( in thousands ) |  |  | Weighted Average Remaining Contractual Term (in y ears) |
Outstanding as of December 31, 2017 |  |  | 102,458 |  |  | $ | 477.62 |  |  | $ | 100.91 |  |  | $ | 23,173 |  |  |  | 8.1 |
Granted |  |  | 12,500 |  |  | $ | 707.17 |  |  | $ | 169.54 |  |  | $ | - |  |  |  | 9.8 |
Exercised |  |  | (11,157 | ) |  | $ | 432.23 |  |  | $ | 89.73 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (2,249 | ) |  | $ | 422.31 |  |  | $ | 87.22 |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2018 |  |  | 101,552 |  |  | $ | 512.09 |  |  | $ | 110.89 |  |  | $ | 18,116 |  |  |  | 8.1 |
Vested and exercisable as of March 31, 2018 |  |  | 15,795 |  |  | $ | 482.94 |  |  | $ | 102.51 |  |  | $ | 3,225 |  |  |  | 7.8 |
Schedule of Share-based Payment Award, Other than Options, Valuation Assumptions [Table Text Block] |
|  | 2018 |
Expected volatility |  |  | 22.53 | %
Risk-free interest rate |  |  | 2.31 | %
Expected term (in years) |  |  | 6.25 |
Expected dividend yield |  |  | 0.98 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards excluding options (for example, stock appreciation rights, restricted stock, phantom stock), including, but not limited to: (a) expected term of awards, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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