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Stock options (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock Options Tables |
Schedule stock option activity |
| 2017 | 2016 | 2015
| Number of options | Weighted average exercise price | Number of options | Weighted average exercise price | Number of options | Weighted average exercise price
|  | US$ |  | US$ |  | US$
Outstanding, beginning of year | - | - | 20,692 | 3.44 | 20,692 | 3.44
Cancelled | - | - | (20,692) | (3.44) | - | -
Outstanding, end of year | - | - | - | - | 20,692 | 3.44
Exercisable, end of year | - | - | - | - | - | -

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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