Note 6 - Goodwill and Other Acquired Intangible Assets, Net Schedule of Goodwill (Details) - Real Estate segment - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, Gross, Beginning of Period	$ 201,099	$ 200,561
Goodwill, Acquired During Period	0	538
Goodwill, Gross, End of Period	201,099	201,099
Goodwill, Impaired, Accumulated Impairment Loss, Beginning of Period	(191,297)	(186,469)
Goodwill, Impairment Loss	0	(4,828)
Goodwill, Impaired, Accumulated Impairment Loss, End of Period	(191,297)	(191,297)
Goodwill, Net	$ 9,802	$ 9,802	$ 14,092