Note 16 - Commitments and Contingencies (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Surety Bonds, Outstanding, Amount	$ 209.0
Letters of Credit Outstanding, Amount	71.4
Estimated Cost Related to Bonds	94.8
Estimated Cost Related to Letters of Credit	30.3
Option Contracts [Member]
Letters of Credit Outstanding, Amount	8.2
Earnest Money Deposits	$ 30.4
Right to Acquire Lots Under Options Contract	9,360
HomeAmerican [Member]
Letters of Credit Outstanding, Amount	$ 41.6