Note 7 - Goodwill and Other Acquired Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, Dispositions	$ (191,297)
Accumulated Amortization, Goodwill, Dispositions	191,297
Goodwill, Dispositions, Net	0
Real Estate segment
Goodwill [Roll Forward]
Goodwill, Gross, Beginning of Period	201,099	$ 200,561
Goodwill, Acquired During Period		538
Goodwill, Gross, End of Period	9,802	201,099
Goodwill, Impaired, Accumulated Impairment Loss, Beginning of Period	(191,297)	(186,469)
Goodwill, Impairment Loss		(4,828)
Goodwill, Impaired, Accumulated Impairment Loss, End of Period	0	(191,297)
Goodwill, Net	$ 9,802	$ 9,802	$ 14,092