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Commitments and Contingencies (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2013
Line of Credit Facility, Maximum Borrowing Capacity $ 15,000,000
Line Of Credit Facility, Maximum Borrowing Percentage 80.00%
Line of Credit Facility, Interest Rate Description Borrowings under the credit line bear interest at the bank's alternate base rate plus 0.5%, or LIBOR plus 2.5%.
Loss Contingency, Damages Sought, Value 8,500,000
Line of Credit Facility, Expiration Date Jun. 30, 2013
Litigation Settlement, Expense $ 300,000