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Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended		6 Months Ended
Commitments and Contingencies (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Commitments and Contingencies (Textual) [Abstract]
Expirations of operating leases			2018
Repayments of the forgiven payments	$ 519,000		$ 519,000
Rent expense	423,000	385,000	903,000	767,000
Collateral for a bank letter of credit	$ 875,000		$ 875,000

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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