Note 20 - Supplemental Guarantor Information - Supplemental Condensed Combining Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income	$ 35,815		$ 27,808	$ 60,050	$ 39,319
Inventory impairments				(4,850)	(1,600)
Interest expense
Other-than-temporary impairment of marketable securities	(100)		(300)	(182)	(719)
Pretax income (loss)	51,894		40,458	88,254	54,731
(Provision) benefit for income taxes	(18,023)		(13,545)	(32,134)	(18,255)
Net income	33,871		26,913	56,120	36,476
Other comprehensive income related to available-for-sale securities, net of tax	1,944		895	3,930	2,843
Homebuilding Segment [Member]
Revenues	648,971		571,511	1,212,697	968,255
Cost of sales	(540,279)		(476,052)	(1,009,432)	(807,741)
Inventory impairments		$ (4,850)	(1,600)	(4,850)	(1,600)
Gross margin	108,692		93,859	198,415	158,914
Selling, general, and administrative expenses	(70,709)		(64,440)	(137,007)	(120,717)
Equity income of subsidiaries
Interest and other income	2,847		2,553	5,174	3,489
Interest expense
Other expense	(666)		(278)	(1,017)	(905)
Other-than-temporary impairment of marketable securities	(1)		(288)	(51)	(719)
Pretax income (loss)	40,163		31,406	65,514	40,062
Financial Services Segment [Member]
Other-than-temporary impairment of marketable securities	(80)			(131)
Pretax income (loss)	11,731		9,052	22,740	14,669
Reportable Legal Entities [Member] | Parent Company [Member]
Comprehensive income	35,815		27,808	60,050	39,319
Pretax income (loss)	30,215		23,412	48,485	28,719
(Provision) benefit for income taxes	3,656		3,501	7,635	7,757
Net income	33,871		26,913	56,120	36,476
Other comprehensive income related to available-for-sale securities, net of tax	1,944		895	3,930	2,843
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Comprehensive income	32,921		27,235	55,143	41,602
Pretax income (loss)	50,400		40,981	86,717	62,424
(Provision) benefit for income taxes	(17,479)		(13,746)	(31,574)	(20,822)
Net income	32,921		27,235	55,143	41,602
Other comprehensive income related to available-for-sale securities, net of tax
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Comprehensive income	7,644		6,045	15,287	9,047
Pretax income (loss)	11,388		8,974	22,192	13,867
(Provision) benefit for income taxes	(4,200)		(3,300)	(8,195)	(5,190)
Net income	7,188		5,674	13,997	8,677
Other comprehensive income related to available-for-sale securities, net of tax	456		371	1,290	370
Reportable Legal Entities [Member] | Homebuilding Segment [Member] | Parent Company [Member]
Revenues
Cost of sales
Inventory impairments
Gross margin
Selling, general, and administrative expenses	(12,233)		(11,228)	(24,628)	(23,330)
Equity income of subsidiaries	40,109		32,909	69,140	50,279
Interest and other income	2,332		2,020	4,008	2,492
Interest expense
Other expense	8		(1)	16	(3)
Other-than-temporary impairment of marketable securities	(1)		(288)	(51)	(719)
Pretax income (loss)	30,215		23,412	48,485	28,719
Reportable Legal Entities [Member] | Homebuilding Segment [Member] | Guarantor Subsidiaries [Member]
Revenues	648,971		571,511	1,212,697	968,255
Cost of sales	(540,279)		(476,052)	(1,009,432)	(807,441)
Inventory impairments			(1,600)	(4,850)	(1,600)
Gross margin	108,692		93,859	198,415	159,214
Selling, general, and administrative expenses	(58,284)		(53,024)	(112,005)	(97,040)
Equity income of subsidiaries
Interest and other income	666		423	1,340	1,152
Interest expense
Other expense	(674)		(277)	(1,033)	(902)
Other-than-temporary impairment of marketable securities
Pretax income (loss)	50,400		40,981	86,717	62,424
Reportable Legal Entities [Member] | Homebuilding Segment [Member] | Non-Guarantor Subsidiaries [Member]
Revenues
Cost of sales					(300)
Inventory impairments
Gross margin					(300)
Selling, general, and administrative expenses
Equity income of subsidiaries
Interest and other income	3		2	4	3
Interest expense
Other expense
Other-than-temporary impairment of marketable securities
Pretax income (loss)	3		2	4	(297)
Reportable Legal Entities [Member] | Financial Services Segment [Member] | Parent Company [Member]
Pretax income (loss)
Reportable Legal Entities [Member] | Financial Services Segment [Member] | Guarantor Subsidiaries [Member]
Pretax income (loss)
Reportable Legal Entities [Member] | Financial Services Segment [Member] | Non-Guarantor Subsidiaries [Member]
Pretax income (loss)	11,385		8,972	22,188	14,164
Consolidation, Eliminations [Member]
Comprehensive income	(40,565)		(33,280)	(70,430)	(50,649)
Pretax income (loss)	(40,109)		(32,909)	(69,140)	(50,279)
(Provision) benefit for income taxes
Net income	(40,109)		(32,909)	(69,140)	(50,279)
Other comprehensive income related to available-for-sale securities, net of tax	(456)		(371)	(1,290)	(370)
Consolidation, Eliminations [Member] | Homebuilding Segment [Member]
Revenues
Cost of sales
Inventory impairments
Gross margin
Selling, general, and administrative expenses	(192)		(188)	(374)	(347)
Equity income of subsidiaries	(40,109)		(32,909)	(69,140)	(50,279)
Interest and other income	(154)		108	(178)	(158)
Interest expense
Other expense
Other-than-temporary impairment of marketable securities
Pretax income (loss)	(40,455)		(32,989)	(69,692)	(50,784)
Consolidation, Eliminations [Member] | Financial Services Segment [Member]
Pretax income (loss)	$ 346		$ 80	$ 552	$ 505