Note 17 - Commitments and Contingencies (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Surety Bonds, Outstanding, Amount	$ 244.8
Letters of Credit Outstanding, Amount	89.6
Estimated Cost Related to Bonds	123.3
Estimated Cost Related to Letters of Credit	43.0
Option Contracts [Member]
Letters of Credit Outstanding, Amount	4.5
Earnest Money Deposits	23.3
HomeAmerican [Member]
Letters of Credit Outstanding, Amount	$ 63.6