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Stock options (Tables)

12 Months Ended

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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- References

No definition available.

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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

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