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Note 11 - Restructuring Costs (Details Textual) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2019	May 31, 2019	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Payments for Restructuring				$ 472
Restructuring Reserve, Ending Balance			$ 0	0	$ 472
Employee Severance [Member]
Restructuring and Related Cost, Number of Positions Eliminated		38
Restructuring Costs, Total			0	0	$ 2,300
Payments for Restructuring			$ 0	$ 500
Employee Severance [Member] \| TAIWAN, PROVINCE OF CHINA
Restructuring and Related Cost, Number of Positions Eliminated	17