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Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities    
Net income (loss) $ (124,033) $ 615,373
Adjustments to reconcile net income (loss) to net cash used in operating activities    
Change in fair value of conversion feature (36,955) 32,918
Stock-based compensation 40,625 46,875
Realized losses on available-for-sale securities 3,419 1,231
Gain on distribution of investment in ClearSign 0 (811,713)
Changes in operating assets and liabilities    
Other current assets (4,792) (5,228)
Accounts payable 11,000 8,500
Income taxes payable (682) 7,213
Net cash used in operating activities (111,418) (104,831)
Cash flows from investing activities    
Purchases of available-for-sale securities (1,478,303) (1,492,106)
Proceeds received from sales of available-for-sale securities 240,633 0
Proceeds received from maturities of available-for-sale securities 1,306,510 1,976,750
Net cash provided by investing activities 68,840 484,644
Net increase (decrease) in cash and cash equivalents (42,578) 379,813
Cash and cash equivalents at beginning of period 113,991 422,984
Cash and cash equivalents at end of period 71,413 802,797
Supplemental cash flow disclosure:    
Income taxes paid 2,800 800
Supplemental non-cash disclosure    
Unrealized gain (loss) on available-for-sale securities (4,663) 6,737
Dividend of investment in ClearSign common stock $ 0 $ 1,803,808