Note 5 - Supplemental Balance Sheet Information - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019		Dec. 31, 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
Income taxes payable	1,751		1,391
Total	96,577		88,020
Accrued Expense [Member]
Operating lease liabilities	$ 15,828	[1]	$ 0

[1] Amounts exclude operating lease assets of $0.3 million, accrued expenses of $0.2 million and other liabilities of $0.2 million that were classified as held for sale at December 31, 2019 (see Note 5).