Fair Value Measurements (Details Textual) (USD $)	Aug. 13, 2012	Jul. 31, 2012	Apr. 30, 2012
Receivables, Fair Value Disclosure		$ 35,000	$ 54,000
Notes Payable, Fair Value Disclosure		4,789,000	4,839,000
Other Notes Payable, Noncurrent		4,453,000	4,486,000
Shareholding Percentage	45.90%
Line Of Credit Facility, Amount Outstanding		16,214,000
Asw Credit Facility [Member]
Shareholding Percentage		45.90%
Accrued Liabilities, Fair Value Disclosure	15,250,000	15,250,000
Line Of Credit Facility, Amount Outstanding	16,214,000	$ 16,214,000