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Stock secured notes payable (Detail) (USD $)	Jun. 30, 2012
Stock secured notes payable
Borrowings percentage on market value of marketable equity securities	50.00%
Notes bearing interest minimum percentage	4.00%
Notes bearing interest maximum percentage	10.00%
Stock secured notes payable and margin borrowings	$ 26,100,000

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- Definition

Borrowings percentage on market value of marketable equity securities

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- Definition

Notes bearing interest maximum percentage

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Notes bearing interest minimum percentage

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- Definition

Stock secured notes payable and margin borrowings

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