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USD ($)
$BalanceAsOf_30Apr2011http://www.sec.gov/CIK0000318154instant2011-04-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDfalsefalse3/31/2011
USD ($)
USD ($) / shares
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USD ($)
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