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Income taxes (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Windfall [Member]
Dec. 31, 2012
Domestic Tax Authority [Member]
Dec. 31, 2012
Foreign Tax Authority [Member]
Dec. 31, 2012
Indian Bureau Of Taxation [Member]
Dec. 31, 2012
Indian Bureau Of Taxation [Member]
Dec. 31, 2012
Indian Bureau Of Taxation [Member]
Dec. 31, 2012
Indian Bureau Of Taxation [Member]
Jan. 31, 2012
Indian Bureau Of Taxation [Member]
Foreign Income Tax Expense (Benefit), Continuing Operations                   $ 323,000       $ 1,100,000
Income Tax Holiday, Aggregate Dollar Amount 1,500,000 1,100,000 100,000                      
Operating Loss Carryforwards             4,200,000 11,400,000 13,100,000          
Operating Loss Carryforwards, Expiration Dates                   These net operating loss carryforwards expire at various times through the year 2032.        
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 700,000 600,000                        
Open Tax Year         2011 2004                
Income Tax Expense (Benefit), Continuing Operations                     339,000 340,000 345,000  
Additional Income Tax Expense Benefit Continuing Operations                   1,000,000        
Undistributed Earnings Of Foreign Subsidiaries 31,700,000                          
Unrecognized Tax Benefits 2,350,000 2,278,000 1,827,000                      
Informal Tax Assessment Received Amount       $ 3,800,000