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Commitments and contingencies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies [Line Items]      
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 at the banks alternate base interest rate plus 0.5% or LIBOR plus 2.5%    
Operating Leases, Rent Expense 3,300,000 3,600,000 3,200,000
Estimated Litigation Liability 8,000,000    
Property, Plant and Equipment, Net 6,083,000 10,656,000  
Litigation Settlement, Expense 250,000    
Line Of Credit Facility Collateral Amount 5,500,000    
Line of Credit Facility, Collateral At December 31, 2013, 80% of the eligible receivables aggregated approximately $5.5 million    
Liens Under Foreign Tax Authority [Member]
      
Commitments and Contingencies [Line Items]      
Property, Plant and Equipment, Net $ 500,000