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Note 3 - Business Acquisition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Sep. 30, 2016
Oct. 01, 2015
Sep. 30, 2015
The Ryland Group, Inc. [Member] | 1.625% Convertible Senior Notes due May 2018 [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Conversion Feature   $ 93,800    
Goodwill, Subsequent Recognition of Deferred Tax Asset $ (35,900)      
The Ryland Group, Inc. [Member]        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     $ 1,972,284  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Conversion Feature     93,834  
Goodwill   $ 970,200 $ 970,185  
1.625% Convertible Senior Notes due May 2018 [Member]        
Debt Instrument, Interest Rate, Stated Percentage 1.625% 1.625%