Note 2 - Restructuring, Impairment and Other Charges and Credits (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Charges, Total	$ 0	$ 225,000
Severance Costs		77,000
Cost of Sales [Member]
Restructuring Charges, Total		161,000
Selling, General and Administrative Expenses [Member]
Restructuring Charges, Total		48,000
Research and Development Expense [Member]
Restructuring Charges, Total		13,000
Other Expense [Member]
Restructuring Charges, Total		3,000
Reduction in Force Program Implemented, and Substantially Paid [Member]
Severance Costs		77,000
Accelerated Depreciation and Other Related On-going Exit Costs [Member]
Severance Costs		$ 148,000