Note 6 - Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Approximate			Cost
	Lives (in years)			2018		2017
Land and land improvements				$	22,130	$	20,880
Buildings and building improvements	10	−	40		85,317		79,820
Revenue and service equipment	3	−	15		648,648		597,644
Furniture and equipment	3	−	7		47,482		46,524
Leasehold improvements	lesser of useful life or lease terms				23,027		25,387
Computer software	1	−	7		71,926		65,559
				$	898,530	$	835,814