Note 5 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Allowance for Doubtful Accounts [Table Text Block]

	Years Ended December 31,
	2019			2018			2017
Balance, beginning of year	$	9,695		$	5,775		$	6,098
Bad debt expense (1)		(1,259	)		8,188			3,155
Write-offs and adjustments		(1,212	)		(4,268	)		(3,478	)
Balance, end of year	$	7,224		$	9,695		$	5,775

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2019		2018 (1)
Raw materials and supplies	$	27,415	$	29,343
Work-in-process		5,739		2,510
Finished products		14,937		15,205
Construction materials		9,102		9,379
Total	$	57,193	$	56,437

Property, Plant and Equipment [Table Text Block]

	Estimated Useful Lives			December 31,
	(Years)			2019			2018
Land and land improvements				$	5,359		$	10,521
Buildings and improvements	5	—	40		50,589			47,430
Machinery and equipment	4	—	10		143,128			147,918
Furniture and fixtures	3	—	10		35,440			37,471
Autos and trucks	3	—	10		47,197			51,129
Construction in progress					7,475			14,626
					289,188			309,095
Less – Accumulated depreciation					(188,097	)		(202,036	)
Property, plant & equipment, less accumulated depreciation				$	101,091		$	107,059

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	2019		2018
Vendor and other accrued expenses	$	30,730	$	35,450
Estimated casualty and healthcare liabilities		13,138		17,419
Job costs		12,041		9,878
Accrued compensation		23,089		23,882
Operating lease liabilities		15,828		—
Income taxes payable		1,751		1,391
Total	$	96,577	$	88,020