Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and cash equivalents (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and cash equivalents (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]    
Cash $ 1,444,000 $ 1,134,974
Money market fund 20,539,000 19,525,868
Total $ 21,983,000 $ 20,660,842