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Earnings per share - Information about the number of shares used to compute earnings per share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Weighted average shares outstanding	1,558,901	1,555,972	1,557,306	1,555,756
Stock options	9,063	2,065	5,491
Shares used to compute diluted earnings per share	1,567,964	1,558,037	1,562,797	1,555,756
Basic earnings per share (in dollars per share)	$ 0.45	$ 0.57	$ 1.30	$ 1.28
Diluted earnings per share (in dollars per share)	$ 0.45	$ 0.56	$ 1.29	$ 1.28

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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