Note 9 - Capitalization of Interest (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Capitalized Interest Transferred from Investments in Unconsolidated Joint Ventures to Inventories Owned	$ 0.5
1.625% Convertible Senior Notes due May 2018 [Member]
Debt Instrument, Increase (Decrease) In Interest Incurred, Net of Interest Capitalized, Valuation of Business Combination		$ 9.0
Debt Instrument, Interest Rate, Stated Percentage	1.625%	1.625%