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Stock-based compensation (Details Textual) (USD $)	3 Months Ended		9 Months Ended						1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Redeemable Preferred Stock [Member]	Sep. 30, 2012 Stock Option [Member]	Sep. 30, 2012 Stock Option [Member] Redeemable Preferred Stock [Member]	Sep. 30, 2011 Stock Option [Member] Redeemable Preferred Stock [Member]	Jul. 31, 2012 2001 Employee Share Option Plan [Member]
Share-based Compensation	$ 100,891	$ 138,206	$ 296,674	$ 339,973
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross							10,033	7,455	5,780
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate							0.08%		0.57%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term							29 days		4 years 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate							30.84%		65.29%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend							3.87%		3.62%
Sale Of Stock, Price Per Share	$ 8.27		$ 8.27
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Non Vested, Outstanding, Number	116,354		116,354
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	199,300		199,300
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Non Vested, Outstanding, Weighted Average Exercise Price	$ 10.51		$ 10.51
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vested and Expected To Vest, Outstanding, Weighted Average Exercise Price	$ 15.34		$ 15.34
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term			3 years 8 months 25 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term			1 year 5 months 28 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized					$ 129,385	$ 189,475
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					1 year 2 months 23 days	3 years 8 months 25 days

X

- Definition

As of the balance sheet date, the number of shares into which non vested stock options outstanding can be converted under the option plan.

+ References

No definition available.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are non vested.

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No definition available.

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Weighted average remaining contractual term for non vested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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Gross number of share options (or share units) granted during the period.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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