SUMMARY OF SIGNIFICANT ACCOUNTING AND FINANCIAL REPORTING POLICIES: (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Jul. 31, 2012	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Impairment of assets	$ 169	$ 1,511	$ 570	$ 10,720
Property, Plant and Equipment, Depreciation Methods		Depreciation and amortization of property, plant and equipment are provided principally by the straight-line method at various rates calculated to amortize the book values of the respective assets over their estimated useful lives, which generally are 10 years or less for furniture and fixtures (including equipment) and 25 to 40 years for buildings and improvements.
Certain Real Estate Principally [Member]
Impairment of assets				5,209
Certain Real Estate Held In Colorado [Member]
Impairment of assets				$ 1,168

Property, Plant and Equipment, Depreciation Methods

Depreciation and amortization of property, plant and equipment are provided principally by the straight-line method at various rates calculated to amortize the book values of the respective assets over their estimated useful lives, which generally are 10 years or less for furniture and fixtures (including equipment) and 25 to 40 years for buildings and improvements.

5,209

Impairment of assets

$ 1,168