Note 4 - Restructuring Activities - Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring liability at beginning of period		$ 155		$ 65
Restructuring charge	0	0	0	625
Amounts paid		(155)		(690)
Restructuring liability at end of period	$ 0		$ 0