Note 6 - Fair Value Measurements - Quantitative Data Regarding Unobservable Inputs and Sensitivity Analysis (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2016
Number of homes closed per year									Increase
Number of homes closed per year									Decrease
Average sales price									Increase
Average sales price									Decrease
Discount rates						9.00%	13.00%
Discount rates									Decrease
Discount rates									Increase
Minimum [Member]
Number of homes closed per year									0
Average sales price									445,000
Discount rates	12.00%	15.00%	12.00%	15.00%	12.00%			11.00%	5.00%
Maximum [Member]
Number of homes closed per year									159
Average sales price									870,000
Discount rates	15.00%	18.00%	15.00%	20.00%	15.00%			14.00%	12.00%
Weighted Average [Member]
Number of homes closed per year									107
Average sales price									548,000
Discount rates									8.20%