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Statements of Operations and Comprehensive Income (Loss) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating expenses        
General and administrative expenses $ 54,825 $ 54,934 $ 202,220 $ 203,189
Loss from operations (54,825) (54,934) (202,220) (203,189)
Other income (expense)        
Interest and dividend income, net 12,218 19,815 45,451 49,011
Change in fair value of conversion feature (245) 335 36,955 (32,918)
Gain on distribution of investment in ClearSign     0 811,713
Realized losses on available-for-sale securities (14,511) (89) (3,419) (1,231)
Income (loss) before provision for income taxes (57,363) (34,873) (123,233) 623,386
Provision for income taxes 0 0 800 8,013
Net income (loss) (57,363) (34,873) (124,033) 615,373
Other comprehensive income        
Unrealized gain (loss) on available-for-sale securities 21,063 (5,580) (4,663) 6,737
Comprehensive gain (loss) $ (36,300) $ (40,453) $ (128,696) $ 622,110
Basic earnings (loss) per common share (in dollars per share) $ (0.01) $ 0.00 $ (0.01) $ 0.08
Diluted earnings (loss) per common share (in dollars per share) $ (0.01) $ 0.00 $ (0.01) $ 0.07
Weighted average number of shares outstanding:        
Basic (in shares) 8,548,393 8,229,757 8,469,173 8,155,137
Diluted (in shares) 8,548,393 8,229,757 8,469,173 9,146,290