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Note 8 - Equity-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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
Unvested as of December 31, 2016			38,425			$	402.13
Granted			13,978			$	619.67
Shares granted due to performance achievement			5,006			$	433.66
Forfeited			(1,904	)		$	432.95
Vested			(284	)		$	380.50
Unvested as of March 31, 2017			55,221			$	459.16
Vested and unissued as of March 31, 2017			2,210			$	415.10

Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]

		Stock Appreciation Rights				Weighted Average Exercise Price				Weighted Average Fair Value				Aggregate Intrinsic Value ( in thousands )				Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 201 6			136,000			$	426.80			$	88.07			$	26,510				8.7
Granted			20,000			$	619.66			$	138.01								9.8
Exercised			(5,625	)		$	422.31			$	87.22
Forfeited			(5,200	)		$	422.31			$	87.22
Outstanding as of March 31, 2017			145,175			$	453.71			$	95.01			$	24,790				8.6
Vested and exercisable as of March 31, 2017			25,550			$	422.31			$	87.22			$	5,165				8.4

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

		201 7
Expected volatility			20.93	%
Risk-free interest rate			2.15	%
Expected term (in years)			6.25
Expected dividend yield			0.96	%

X

- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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+ References

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