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Pension benefits (Details Textual) (USD $)	12 Months Ended
Pension benefits (Details Textual) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Entities Matching Contribution, Amount	$ 100,000
Pension Expense	519,000	668,000	501,000
Defined Benefit Plan, Accumulated Benefit Obligation	$ 1,900,000	$ 1,800,000

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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