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Commitments and contingencies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Line of Credit Facility, Amount Outstanding $ 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%.    
Operating Leases, Rent Expense 3,600,000 3,200,000 3,000,000
Estimated Litigation Liability 8,500,000    
Property, Plant and Equipment, Net 10,656,000 7,430,000  
Litigation Settlement, Expense 300,000    
Liens Under Foreign Tax Authority [Member]
      
Property, Plant and Equipment, Net $ 300,000