Note 20 - Supplemental Guarantor Information - Supplemental Condensed Combining Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 424,625	$ 474,212	$ 476,066	$ 470,139
Total Assets	3,373,712	3,338,356
Accrued and other liabilities	233,034	245,940
Total Liabilities	1,562,635	1,555,871
Total Stockholders' Equity	1,811,077	1,782,485	1,610,706	1,576,000
Total Liabilities and Stockholders' Equity	3,373,712	3,338,356
Homebuilding Segment [Member]
Cash and cash equivalents	386,704	424,186	416,374
Restricted cash	15,762	14,279	8,136
Trade and other receivables	69,301	65,829
Housing completed or under construction	1,215,214	1,036,191
Land and land under development	1,301,433	1,330,384
Total inventories	2,516,647	2,366,575
Intercompany receivables	0	0
Investment in subsidiaries	0	0
Property and equipment, net	62,316	60,414
Deferred tax asset, net	20,660	21,768
Prepaid and other assets	78,002	78,358
Total Assets	3,149,392	3,031,409
Marketable securities	43,985	56,747
Accounts payable	97,980	87,364
Accrued and other liabilities	233,034	245,940
Advances and notes payable to parent and subsidiaries	0	0
Revolving credit facility	15,000	15,000
Senior notes, net	1,036,900	989,422
Total Liabilities	1,382,914	1,337,726
Other assets	506	1,288
Financial Services Segment [Member]
Cash and cash equivalents	22,159	35,747	51,556
Intercompany receivables	0	0
Prepaid and other assets	24,255
Total Assets	224,320	306,947
Marketable securities	43,985	56,747
Mortgage loans held-for-sale, net	133,921	197,021
Advances and notes payable to parent and subsidiaries	0	0
Total Liabilities	179,721	218,145
Accounts payable and accrued liabilities	70,977	68,529
Mortgage repurchase facility	108,744	149,616
Other assets	24,255	17,432
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and cash equivalents	380,318	418,822	411,750	410,127
Total Assets	3,001,114	2,924,942
Accrued and other liabilities		84,088
Total Liabilities	1,190,037	1,142,457
Total Stockholders' Equity	1,811,077	1,782,485
Total Liabilities and Stockholders' Equity	3,001,114	2,924,942
Reportable Legal Entities [Member] | Parent Company [Member] | Homebuilding Segment [Member]
Cash and cash equivalents	380,318	418,822
Restricted cash	0	0
Trade and other receivables	694	624
Housing completed or under construction	0	0
Land and land under development	0	0
Total inventories	0	0
Intercompany receivables	2,265,553	1,936,075
Investment in subsidiaries	279,593	488,993
Property and equipment, net	23,033	23,192
Deferred tax asset, net	18,962	22,508
Prepaid and other assets	32,961	34,728
Total Assets	3,001,114	2,924,942
Marketable securities	0	0
Accounts payable	515	289
Accrued and other liabilities	67,874
Advances and notes payable to parent and subsidiaries	69,748	53,658
Revolving credit facility	15,000	15,000
Senior notes, net	1,036,900	989,422
Total Liabilities	1,190,037	1,142,457
Reportable Legal Entities [Member] | Parent Company [Member] | Financial Services Segment [Member]
Cash and cash equivalents	0	0
Intercompany receivables	0	0
Prepaid and other assets	0
Total Assets	0	0
Mortgage loans held-for-sale, net	0	0
Advances and notes payable to parent and subsidiaries	0	0
Total Liabilities	0	0
Accounts payable and accrued liabilities	0	0
Mortgage repurchase facility	0	0
Other assets		0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash and cash equivalents	22,148	19,643	12,760	10,960
Total Assets	2,697,645	2,538,645
Accrued and other liabilities		156,652
Total Liabilities	2,514,949	2,156,696
Total Stockholders' Equity	182,696	381,949
Total Liabilities and Stockholders' Equity	2,697,645	2,538,645
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] | Homebuilding Segment [Member]
Cash and cash equivalents	6,386	5,364
Restricted cash	15,762	14,279
Trade and other receivables	68,607	65,205
Housing completed or under construction	1,215,214	1,036,191
Land and land under development	1,301,433	1,330,384
Total inventories	2,516,647	2,366,575
Intercompany receivables	5,919	6,370
Investment in subsidiaries	0	0
Property and equipment, net	39,283	37,222
Deferred tax asset, net	0	0
Prepaid and other assets	45,041	43,630
Total Assets	2,697,645	2,538,645
Marketable securities	0	0
Accounts payable	97,465	87,075
Accrued and other liabilities	162,742
Advances and notes payable to parent and subsidiaries	2,254,742	1,912,969
Revolving credit facility	0	0
Senior notes, net	0	0
Total Liabilities	2,514,949	2,156,696
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] | Financial Services Segment [Member]
Cash and cash equivalents	0	0
Intercompany receivables	0	0
Prepaid and other assets	0
Total Assets	0	0
Mortgage loans held-for-sale, net	0	0
Advances and notes payable to parent and subsidiaries	0	0
Total Liabilities	0	0
Accounts payable and accrued liabilities	0	0
Mortgage repurchase facility	0	0
Other assets		0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	22,159	35,747	51,556	49,052
Total Assets	290,684	353,960
Accrued and other liabilities		0
Total Liabilities	193,787	246,916
Total Stockholders' Equity	96,897	107,044
Total Liabilities and Stockholders' Equity	290,684	353,960
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] | Homebuilding Segment [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Trade and other receivables	0	0
Housing completed or under construction	0	0
Land and land under development	0	0
Total inventories	0	0
Intercompany receivables	0	0
Investment in subsidiaries	0	0
Property and equipment, net	0	0
Deferred tax asset, net	0	0
Prepaid and other assets	0	0
Total Assets	0	0
Marketable securities	43,985	56,747
Accounts payable	0	0
Accrued and other liabilities	0
Advances and notes payable to parent and subsidiaries	0	0
Revolving credit facility	0	0
Senior notes, net	0	0
Total Liabilities	0	0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] | Financial Services Segment [Member]
Cash and cash equivalents	22,159	35,747
Intercompany receivables	64,666	47,753
Prepaid and other assets	25,953
Total Assets	290,684	353,960
Mortgage loans held-for-sale, net	133,921	197,021
Advances and notes payable to parent and subsidiaries	11,648	23,571
Total Liabilities	193,787	246,916
Accounts payable and accrued liabilities	73,395	73,729
Mortgage repurchase facility	108,744	149,616
Other assets		16,692
Consolidation, Eliminations [Member]
Cash and cash equivalents	0	0	$ 0	$ 0
Total Assets	(2,615,731)	(2,479,191)
Total Liabilities	(2,336,138)	(1,990,198)
Total Stockholders' Equity	(279,593)	(488,993)
Total Liabilities and Stockholders' Equity	(2,615,731)	(2,479,191)
Consolidation, Eliminations [Member] | Homebuilding Segment [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Trade and other receivables	0	0
Housing completed or under construction	0	0
Land and land under development	0	0
Total inventories	0	0
Intercompany receivables	(2,271,472)	(1,942,445)
Investment in subsidiaries	(279,593)	(488,993)
Property and equipment, net	0	0
Deferred tax asset, net		(740)
Prepaid and other assets	0	0
Total Assets	(2,549,367)	(2,432,178)
Marketable securities	0	0
Accounts payable	0	0
Advances and notes payable to parent and subsidiaries	(2,324,490)	(1,966,627)
Revolving credit facility	0	0
Senior notes, net	0	0
Total Liabilities	(2,322,072)	(1,961,427)
Consolidation, Eliminations [Member] | Financial Services Segment [Member]
Cash and cash equivalents	0	0
Intercompany receivables	(64,666)	(47,753)
Prepaid and other assets	(1,698)
Total Assets	(66,364)	(47,013)
Mortgage loans held-for-sale, net	0	0
Advances and notes payable to parent and subsidiaries	(11,648)	(23,571)
Total Liabilities	(14,066)	(28,771)
Accounts payable and accrued liabilities	(2,418)	(5,200)
Mortgage repurchase facility	0	0
Segment Reconciling Items [Member]
Accrued and other liabilities		5,200
Segment Reconciling Items [Member] | Homebuilding Segment [Member]
Deferred tax asset, net	1,698
Accrued and other liabilities	$ 2,418
Segment Reconciling Items [Member] | Financial Services Segment [Member]
Other assets		$ 740