Note 2 - Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Property, Plant and Equipment [Table Text Block]

	2019			2018			Estimated Life (Years)
Land	$	137,416		$	134,873			–
Buildings and improvements		474,106			434,049		10	–	39
Leasehold improvements		34,350			27,165		2	–	39
Machinery and shop equipment		82,594			73,578		5	–	20
Furniture, fixtures and computers		73,846			67,330		3	–	15
Transportation equipment		99,127			92,385		3	–	15
Lease and rental vehicles		968,121			914,708		1	–	8
Construction in progress		16,874			16,310
Accumulated depreciation and amortization		(606,503	)		(576,345	)
Total	$	1,279,931		$	1,184,053

Schedule of Goodwill [Table Text Block]

Balance December 31, 2018	$	291,391
Acquisitions		751
Balance December 31, 2019	$	292,142

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

	2019			2018			2017
Expected stock volatility		31.29	%		31.68	%		33.54	%
Weighted-average stock volatility		31.29	%		31.68	%		33.54	%
Expected dividend yield		1.13	%		0.00	%		0.00	%
Risk-free interest rate		2.45	%		2.69	%		2.17	%
Expected life (years)		6.0			6.0			6.0
Weighted-average fair value of stock options granted	$	12.56		$	15.46		$	12.33