Note 5 - Supplemental Balance Sheet Information (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Credit Loss Expense (Reversal)	[1]	$ (1,259)	$ 8,188	$ 3,155
Inventory Write-down			2,800
Depreciation, Total		22,200	23,900	29,300
Restructuring 2016 and 2017 [Member]
Accounts Receivable, Credit Loss Expense (Reversal)		$ (100)	$ 5,300	$ 400

[1] The Company recorded bad debt expense (reversals) of less than ($0.1) million, $5.3 million and $0.4 million in 2019, 2018 and 2017, respectively, as part of the restructuring efforts (see Note 4) and was primarily due to the exiting of certain low-return businesses mainly in foreign locations.