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Stock plans - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award      
Share based compensation expense $ 71,000 $ 69,000 $ 70,000
Settlement of stock options     $ 83,000
Restricted stock cost $ 0    
Share based compensation requisite service period 5 years    
Restricted stock vested period 5 years    
Unrecognized compensation expense $ 0 $ 0  
2008 Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Common stock available for grant as awards 129,207    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation expense $ 37,000