Note 18 - Commitments and Contingencies (Details Textual) Pure in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Surety Bonds, Outstanding, Amount	$ 264.0
Letters of Credit Outstanding, Amount	98.7
Estimated Cost Related to Bonds	136.1
Estimated Cost Related to Letters of Credit	64.7
Estimated Litigation Liability	1.6	$ 1.6
Earnest Money Deposits	$ 14.3	$ 6.4
Right to Acquire Lots Under Options Contract	8,881
Option Contracts [Member]
Letters of Credit Outstanding, Amount	$ 6.2
Earnest Money Deposits	23.2
HomeAmerican [Member]
Letters of Credit Outstanding, Amount	$ 75.2