Note 16 - Results of Quarterly Operations (Unaudited) (Details) - Quarterly Information - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	[1]	Dec. 31, 2014	[1]	Dec. 31, 2013
2015:
Revenues	$ 1,698,198	$ 659,200	$ 707,044	$ 475,671	$ 760,944	$ 611,323	$ 598,850	$ 465,381	$ 3,540,113		$ 2,436,498
Homebuilding gross margin	330,669	159,756	171,941	114,105	182,433	159,060	157,940	118,950	776,471		618,383		$ 469,196
Net income	$ 77,529	$ 47,177	$ 57,198	$ 31,605	$ 64,644	$ 56,599	$ 56,463	$ 38,159	$ 213,509		$ 215,865		$ 188,715
Basic income per common share (in Dollars per share)	$ 0.64	$ 0.65	$ 0.80	$ 0.45	$ 0.88	$ 0.77	$ 0.75	$ 0.50	$ 2.51		$ 2.94		$ 2.59
Diluted income per common share (in Dollars per share)	$ 0.56	$ 0.59	$ 0.70	$ 0.40	$ 0.80	$ 0.70	$ 0.70	$ 0.45	$ 2.26		$ 2.68		$ 2.36

[1] Per share amounts do not add across due to rounding differences in quarterly amounts and due to the impact of differences between the quarterly and annual weighted average share calculations.