Stock-based compensation (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Stock Option Grants |
There were no options granted during 2015. During 2014, the Company granted the following options:
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| Schedule of Assumptions Used to Estimate Fair Value of Stock Option Award Using Black-Scholes Valuation Model |
The fair value of each option grant is estimated on the date of grant using the Black-Scholes model with the following weighted-average assumptions:
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| Summary of Stock Option Activity Under Stock Option and Incentive Plans |
A summary of the status of stock option awards and changes during the year ended December 31, 2015 are presented below:
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- Definition Schedule of Stock Option Grants [Table Text Block] No definition available.
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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 share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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