Note 16 - Commitments and Contingencies (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Surety Bonds, Outstanding, Amount	$ 205.4
Letters of Credit Outstanding, Amount	72.0
Estimated Cost Related to Bonds	71.9
Estimated Cost Related to Letters of Credit	33.5
Option Contracts [Member]
Letters of Credit Outstanding, Amount	6.0
Earnest Money Deposits	$ 24.8
Right to Acquire Lots Under Options Contract	8,882
HomeAmerican [Member]
Letters of Credit Outstanding, Amount	$ 39.3