Note 22 - Stock Based Compensation - Performance Stock Units Granted (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair value per share (in dollars per share)		$ 33.85	$ 29.51	$ 27.42
Performance Shares [Member] | Chief Executive Officer [Member] | July 25, 2016 [Member]
Base period revenues		$ 1,975,000
Threshold goal, number of PSUs (in shares)		137,781
Threshold goal, home sale revenues		$ 2,074,000
Target goal, number of PSUs (in shares)		275,562
Target goal, home sale revenues		$ 2,173,000
Maximum goal, number of PSUs (in shares)		551,124
Maximum goal, home sale revenues		$ 2,370,000
Fair value per share (in dollars per share)		$ 19.66
Maximum potential expense to be recognized		$ 10,834
Maximum remaining expense to be recognized	[1]	0
Performance Shares [Member] | Chief Executive Officer [Member] | June 20, 2017 [Member]
Base period revenues		$ 2,426,000
Threshold goal, number of PSUs (in shares)		144,342
Threshold goal, home sale revenues		$ 2,547,000
Target goal, number of PSUs (in shares)		288,684
Target goal, home sale revenues		$ 2,669,000
Maximum goal, number of PSUs (in shares)		577,368
Maximum goal, home sale revenues		$ 2,911,000
Fair value per share (in dollars per share)		$ 27.83
Maximum potential expense to be recognized	[1]	$ 16,070
Maximum remaining expense to be recognized	[1]	1,446
Performance Shares [Member] | Chief Executive Officer [Member] | May 23, 2018 [Member]
Base period revenues		$ 2,543,000
Threshold goal, number of PSUs (in shares)		145,800
Threshold goal, home sale revenues		$ 2,670,000
Target goal, number of PSUs (in shares)		291,600
Target goal, home sale revenues		$ 2,797,000
Maximum goal, number of PSUs (in shares)		583,200
Maximum goal, home sale revenues		$ 3,052,000
Fair value per share (in dollars per share)		$ 25.57
Maximum potential expense to be recognized		$ 14,915
Maximum remaining expense to be recognized	[1]	8,623
Performance Shares [Member] | Chief Executive Officer [Member] | August 5, 2019 [Member]
Base period revenues		$ 2,982,000
Threshold goal, number of PSUs (in shares)		135,000
Threshold goal, home sale revenues		$ 3,131,000
Target goal, number of PSUs (in shares)		270,000
Target goal, home sale revenues		$ 3,280,000
Maximum goal, number of PSUs (in shares)		540,000
Maximum goal, home sale revenues		$ 3,578,000
Fair value per share (in dollars per share)		$ 32.60
Maximum potential expense to be recognized	[1]	$ 17,604
Maximum remaining expense to be recognized	[1]	$ 17,604

[1] Dollars in thousands