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Shareholders' equity and capital stock (Details)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Beginning Balance, Warrants | 100,000 | 100,000 | 0 |
| Granted, Warrants | 50,000 | 0 | 100,000 |
| Ending Balance, Warrants | 150,000 | 100,000 | 100,000 |
| Beginning Balance, Weighted-average exercise price | 1.20 | 1.20 | 0 |
| Granted, Weighted-average exercise price | 0.99 | 0 | 1.20 |
| Ending Balance, Weighted-average exercise price | 1.13 | 1.20 | 1.20 |
| X | ||||||||||
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- Definition
The exercise price of each class of warrants or rights granted during the period. No definition available.
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| X | ||||||||||
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- Definition
Aggregate number of each class of warrants or rights granted during the period. No definition available.
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| X | ||||||||||
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- Definition
The exercise price of each class of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate amount of each class of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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