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 -Name Staff Accounting Bulletin (SAB)
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 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
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 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
 -Section P
 -Subsection 3, 4

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1/1/2011 - 3/31/2011
USD ($)
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 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
 -Section P
 -Subsection 3, 4

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USD ($)
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1/1/2010 - 3/31/2010
USD ($)
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USD ($)
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 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
 -Section P
 -Subsection 3, 4

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 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
 -Section P
 -Subsection 3, 4

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 -Paragraph 2-6, 8-17, 20

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
 -Section P
 -Subsection 3, 4

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
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 -Paragraph 2-6, 8-17, 20

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
 -Section P
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 -Publisher FASB
 -Name Emerging Issues Task Force (EITF)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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