Note 3 - Segment Reporting (Details Textual) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Number of Operating Segments			2
Number of Reportable Segments			4
Homebuilding [Member] | North [Member]
Depreciation, Depletion and Amortization, Nonproduction	$ 2.0	$ 1.7	$ 5.6	$ 4.5
Homebuilding [Member] | Southeast [Member]
Depreciation, Depletion and Amortization, Nonproduction	4.5	4.2	12.2	11.2
Homebuilding [Member] | Southwest [Member]
Depreciation, Depletion and Amortization, Nonproduction	2.3	2.8	7.8	8.6
Homebuilding [Member] | West [Member]
Depreciation, Depletion and Amortization, Nonproduction	$ 5.3	$ 7.1	$ 16.1	$ 18.9