Note 4 - Real Estate Inventories - Inventory Impairments (Details) $ in Thousands		3 Months Ended			12 Months Ended
		Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Impairments					$ 19,000	$ 10,200	$ 10,000
Remaining carrying value of inventory impaired at year end			$ 81,622		$ 47,178	$ 81,622	$ 57,845
Number of projects impaired during the year					5	3	2
Total number of projects subject to periodic impairment review during the year (1)	[1]				31	27	26
Home Building [Member]
Impairments		$ 19,000	$ 6,600	$ 1,700	$ 19,000	$ 8,300	$ 10,000
Land [Member]
Impairments				$ 1,900	$ 0	$ 1,900	$ 0

[1] Represents the peak number of real estate projects that we had during each respective year. The number of projects outstanding at the end of each year may be less than the number of projects listed herein.