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Significant accounting policies (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Cash, cash equivalents and short term investments:      
Cash and cash equivalent investment portfolio, percentage 24.00%    
Percentage of any single short-term security held in investment portfolio, maximum 5.00%    
Cumulative amount of realized loss on investments to date has not exceeded $ 5,000    
Unrealized gain (loss) on marketable investments (38,869) 1,260  
Management fees, marketable securities $ 3,893 $ 657  
Income (loss) per share:      
Shares not included in the computation of EPS 1,774,000 2,862,000  
Reverse stock split ratio     6
Weighted average number of shares outstanding basic and diluted, pre-split   9,633,321  
Weighted average number of shares outstanding basic and diluted, post-split   1,608,146