Annual report pursuant to Section 13 and 15(d)

Organization and summary of significant accounting policies (Organization) (Details)

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Organization and summary of significant accounting policies (Organization) (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Organization and summary of significant accounting policies [Abstract]        
Cash and liquid investments $ 14,301,000      
Working capital 12,512,000      
Stockholders' equity 12,949,797 10,691,000 3,825,878 11,247,437
Accumulated deficit $ (86,381,788) $ (74,233,133)