Note 6 - Fair Value Measurements - Quantitative Data Regarding Unobservable Inputs and Sensitivity Analysis (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)
Forecasted number of homes closed per year	Increase
Forecasted number of homes closed per year	Decrease
Forecasted assessed value	Increase
Forecasted assessed value	Decrease
Discount rates	Decrease
Discount rates	Increase
Minimum [Member]
Forecasted number of homes closed per year	0
Forecasted assessed value	$ 401,000
Discount rates	5.00%
Maximum [Member]
Forecasted number of homes closed per year	120
Forecasted assessed value	$ 1,200,000
Discount rates	12.00%
Weighted Average [Member]
Forecasted number of homes closed per year	107
Forecasted assessed value	$ 558,000
Discount rates	7.50%