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8. Subordinated Convertible Debentures Payable (Tables)
12 Months Ended
Dec. 31, 2012
Brokers and Dealers [Abstract]  
Subordinated debentures payable
    2012     2011  
                 
6 ½%, due June 1991   $ 1,034,000     $ 1,034,000  
6%, due May 1992     8,025,000       8,025,000  
    $ 9,059,000     $ 9,059,000