Note 2 - Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Property, Plant and Equipment [Table Text Block]

	20 17			201 6			Estimated Life (Years)
Land	$	129,805		$	126,123			–
Buildings and improvements		404,679			377,070		10	–	39
Leasehold improvements		26,765			26,925		2	–	39
Machinery and shop equipment		65,694			67,558		5	–	20
Furniture, fixtures and computers		63,475			73,912		3	–	15
Transportation equipment		81,158			73,156		2	–	15
Lease and rental vehicles		894,905			832,661		2	–	8
Construction in progress		8,043			11,921
Accumulated depreciation and amortization		(514,929	)		(453,521	)
Total	$	1,159,595		$	1,135,805

Schedule of Goodwill [Table Text Block]

Balance January 1, 2016	$	285,041
Acquisitions and adjustments		5,150
Balance December 31, 201 6		290,191
Acquisition		1,200
Balance December 31, 201 7	$	291,391

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

	20 17			20 16			20 15
Expected stock volatility		33.54	%		35.63	%		40.90	%
Weighted-average stock volatility		33.54	%		35.63	%		40.90	%
Expected dividend yield		0.00	%		0.00	%		0.00	%
Risk-free interest rate		2.17	%		1.64	%		1.74	%
Expected life (years)		6.0			6.0			6.0
Weighted-average fair value of stock options granted	$	12.33		$	6.54		$	11.27