8. Stockholders' equity (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Stockholders Equity Details
Outstanding Number Of Share, Beginning Balance	2,345,000	2,589,692
Granted
Exercised
Expired	(200,000)	(244,692)
Outstanding Number Of Share, Ending Balance	2,145,000	2,345,000
Weighted average exercise price Beginning balance	$ 0.23	$ 0.29
Granted
Exercised
Expired	$ 0.23	$ 0.91
Weighted average exercise price, Ending balance	$ 0.23	$ 0.23

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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