Note 3 - Supplemental Income Statement and Cash Flow Disclosure - Other Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net realized gains from the sales of marketable securities	$ (0)	$ (0)	$ 18,122
Realized gain from the sale of metropolitan district bond securities (related party)	(0)	(0)	35,847
Homebuilding Segment [Member]
Interest income	7,797	6,376	3,896
Dividend income	0	0	1,160
Net realized gains from the sales of marketable securities	0	0	17,775
Realized gain from the sale of metropolitan district bond securities (related party)	0	0	35,847
Other income	1,273	1,342	2,658
Interest and other income	9,070	7,718	61,336
Financial Services Segment [Member]
Interest income	4,404	4,031	2,924
Dividend income	1,022	869	1,031
Net realized gains from the sales of marketable securities	11,797	(3,745)	0
Interest and other income	$ 17,223	$ 1,155	$ 3,955