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Note 11 - Equity-based Compensation (Tables)

3 Months Ended

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	%

X

- 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.

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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

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