Note 17 - Commitments and Contingencies (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Surety Bonds, Outstanding, Amount	$ 245.5
Letters of Credit Outstanding, Amount	89.3
Estimated Cost Related to Bonds	126.6
Estimated Cost Related to Letters of Credit	51.2
Option Contracts [Member]
Letters of Credit Outstanding, Amount	4.8
Earnest Money Deposits	19.3
HomeAmerican [Member]
Letters of Credit Outstanding, Amount	$ 61.7