Note 7 - Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions	May. 15, 2014	Jul. 31, 2015	Jul. 31, 2014
Note 7 - Commitments and Contingent Liabilities (Details) [Line Items]
Aggregate Retention for Construction Defects, Warranty and Bodily Injury Claims		$ 21	$ 21
Aggregate Retention For Construction Defects Warranty and Bodily Injury Claims Amount Exceeded		$ 30
DAndrea VHovnanian [Member]
Note 7 - Commitments and Contingent Liabilities (Details) [Line Items]
Litigation Settlement, Amount	$ (21)