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Stockholders' equity (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Stockholders' equity

		Shares of common stock
		Class A				Class B
		Issued and outstanding				Issued and outstanding
Balance at December 31, 2009			2,370,307				10,000,000
Issued			5,000				—
Balance at December 31, 2010			2,375,307				10,000,000
Issued			10,800				—
Balance at December 31, 2011			2,386,107				10,000,000
Issued			6,000				—
Balance at December 31, 2012			2,392,107				10,000,000

X

- Definition

Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

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