Note 17 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Surety Bonds, Outstanding, Amount	$ 227,500
Letters of Credit Outstanding, Amount	90,500
Estimated Cost Related to Bonds	104,600
Estimated Cost Related to Letters of Credit	41,300
Estimated Litigation Liability	1,600	$ 2,700
Earnest Money Deposits	$ 6,400	8,800
Right to Acquire Lots Under Options Contract	6,890
Option Contracts [Member]
Letters of Credit Outstanding, Amount	$ 7,000
Earnest Money Deposits	21,900
Selling, General and Administrative Expenses [Member]
Operating Leases, Rent Expense, Total	7,400	$ 7,100	$ 5,400
HomeAmerican [Member]
Letters of Credit Outstanding, Amount	$ 62,600