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Investments: (Details 2) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 25, 2011
Jun. 25, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Tomsten
Jun. 30, 2012
Investment in senior subordinated promissory notes in BridgeFunds
Dec. 31, 2011
Investment in senior subordinated promissory notes in BridgeFunds
Investments              
Long-term investment     $ 3,539,300 $ 3,817,400 $ 8,500,000 $ 1,300,000  
Investment owned as a percentage of outstanding common stock         22.00%    
Investment attributable to goodwill         300,000    
Current carrying amount of investment         2,200,000    
Investment at cost           2,000,000  
Effective interest rate on notes used as a discounting factor for determining present value of expected future cash flows (as a percent)           15.00%  
Impairment charges 252,900 252,900         883,100
Interest receivable           $ 200,000