Note 2 - Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Property, Plant and Equipment [Table Text Block]

	2015			2014			Estimated Life (Years)
Land	$	134,246		$	98,033			–
Buildings and improvements		313,706			233,742		10	–	39
Leasehold improvements		28,149			27,100		2	–	39
Machinery and shop equipment		59,455			48,988		5	–	20
Furniture, fixtures and computers		74,201			57,730		3	–	15
Transportation equipment		74,761			47,758		2	–	15
Lease and rental vehicles		825,787			697,147		2	–	8
Construction in progress		66,338			39,775
Accumulated depreciation and amortization		(403,819	)		(327,193	)
Total	$	1,172,824		$	923,080

Schedule of Goodwill [Table Text Block]

Balance December 31, 2013	$	215,464
Acquisitions		49,609
Adjustment		72
Balance December 31, 2014		265,145
Acquisitions		19,896
Balance December 31, 2015	$	285,041

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

	2015		2014		2013
Expected stock volatility		40.90%		51.51%		49.59%
Weighted-average stock volatility		40.90%		51.51%		49.59%
Expected dividend yield		0.0%		0.0%		0.0%
Risk-free interest rate		1.74%		2.14%		1.22%
Expected life (years)		6.0		6.5		6.5
Weighted-average fair value of stock options granted	$	11.27	$	15.86	$	12.69