Note 1 - Business Overview (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Dec. 31, 2019
Restructuring Charges, Total	$ 8,800	$ 858
Other Restructuring Costs			$ 7,400
Restructuring Reserve, Ending Balance	882	988	$ 882
Accrued Expense [Member]
Restructuring Reserve, Ending Balance		1,000
Cost of Sales [Member]
Other Restructuring Costs	7,400
Restructuring and Other Charges [Member]
Severance Costs	$ 1,400	$ 900