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Debt Obligations (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jul. 26, 2007
Debt Disclosure [Line Items]
Amount of borrowings from RB International Finance (USA) LLC	$ 2,150,000	$ 2,610,000	$ 5,000,000
Less current portion	1,100,000	1,000,000
Long-term debt obligations	1,050,000	1,610,000
RZB Note and the accrued and unpaid estimated income taxes
Debt Disclosure [Line Items]
Amount of borrowings from RB International Finance (USA) LLC	$ 2,150,000	$ 2,610,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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