Note 7 - Goodwill and Other Acquired Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Impairment of goodwill	$ (4,828)	$ 0	$ 0	$ 0	$ 0	$ (4,828)	$ 0
Goodwill, Dispositions					(191,297)
Accumulated Amortization, Goodwill, Dispositions					191,297
Goodwill, Dispositions, Net					0
Real Estate Segment
Goodwill [Line Items]
Beginning Balance, Goodwill, Gross				200,561	201,099	200,561
Beginning Balance, Accumulated Impairment Loss				(186,469)	(191,297)	(186,469)
Beginning Balance, Goodwill, Net				$ 14,092	9,802	14,092
Goodwill, Acquired During Period						538
Impairment of goodwill					0	(4,828)
Ending Balance, Goodwill, Gross	201,099				9,802	201,099	200,561
Ending Balance, Accumulated Impairment Loss	(191,297)				0	(191,297)	(186,469)
Beginning Balance, Goodwill, Net	$ 9,802				$ 9,802	$ 9,802	$ 14,092