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Stock-based compensation
9 Months Ended
Sep. 30, 2013
Stock-based compensation [Abstract]  
Stock-based compensation
 
6.Stock-based compensation:

As of September 30, 2013, all stock options were fully vested and there are no unrecognized compensation costs related to stock options.  There were no stock options granted during the three and nine month periods ending September 30, 2013 and 2012.