Note 14 - Restructuring Charges - Activity for Lease Exit and Severance Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Balance at December 31, 2019	$ 4,381	$ 6,753
General and administrative charges	1,274	5,885
Cash payments	(1,994)	(6,180)
Balance at September 30, 2020	3,661	6,458
Lease Exit [Member]
Balance at December 31, 2019	4,109	6,468
General and administrative charges	198	251
Cash payments	(720)	(1,960)
Balance at September 30, 2020	3,587	4,759
Employee Severance [Member]
Balance at December 31, 2019	272	285
General and administrative charges	1,076	5,634
Cash payments	(1,274)	(4,220)
Balance at September 30, 2020	$ 74	$ 1,699