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Summary of stock option activity (Details) | No. Of shares | Weighted-Average exercise price | Weighted-Average Remaining Contractual term (Years) | Aggregate Intrinsic value
--- | --- | --- | --- | ---
Outstanding options at Dec. 31, 2011 | 310,000 | 3.03 |  |
Forfeited | (50,000) | 2.54 |  |
Expired | (235,000) | 3.19 |  |
Exercisable at December 31, 2012 at Dec. 31, 2012 | 25,000 | 2.54 | 0.4 | 0
Outstanding options. at Dec. 31, 2012 | 25,000 | 2.54 | 0.4 | 0

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