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Note 17 - Restructuring Costs (Details Textual) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2019	May 31, 2019	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Payments for Restructuring			$ 461	$ 1,507
Restructuring Reserve, Ending Balance			0	461
Employee Severance [Member]
Restructuring and Related Cost, Number of Positions Eliminated		38
Restructuring Costs, Total			0	$ 2,300
Payments for Restructuring			$ 500
Employee Severance [Member] \| TAIWAN, PROVINCE OF CHINA
Restructuring and Related Cost, Number of Positions Eliminated	17