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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The significant weighted average assumptions for the years ended December 31, 2017, 2016 and 2015 were as follows:
|  | 2017 |  | 2016 |  | 2015 |
Risk free interest rate |  |  | 1.12 | % |  | 0.43 | % |  | 0.41 | %
Expected option life (years) |  |  | 1.1 |  |  | 1.4 |  |  | 1.4 |
Expected volatility |  |  | 37.24 | % |  | 33.49 | % |  | 33.74 | %
Expected dividend yield |  |  | 2.41 | % |  | 2.29 | % |  | 2.35 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of the Company’s stock option activity for the year ended December 31, 2017 is as follows:
|  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (1) |
Outstanding at beginning of period |  |  | 17,600 |  | $ | 12.02 |  |  |  |  |  |
Granted |  |  | 12,831 |  |  | 9.42 |  |  |  |  |  |
Exercised |  |  | (2,129) |  |  | 8.35 |  |  |  |  |  |
Forfeited/expired |  |  | (16,217) |  |  | 10.18 |  |  |  |  |  |
Outstanding as of December 31, 2017 |  |  | 12,085 |  | $ | 12.38 |  | 2.22 years |  | $ | 3,658 |
Exercisable as of December 31, 2017 |  |  | - |  | $ | 0.00 |  | - years |  | $ | - |
| (1) | The intrinsic value of a stock option represents the amount by which the fair value of the underlying stock, measured by reference to the closing price of the common shares of $12.60 on the Nasdaq Global Select Market on December 31, 2017, exceeds the exercise price of the option.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following table summarizes the weighted average fair value of options at the date of grant and the intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015 |
Options granted with an exercise price below market price on the date of grant: |  |  |  |  |  |  |  |  |  |
Employees — preferred stock |  | $ | 4.11 |  | $ | 4.48 |  | $ | 4.19 |
Overall weighted average |  |  | 4.11 |  |  | 4.48 |  |  | 4.19 |
Options granted with an exercise price at market price on the date of grant: |  |  |  |  |  |  |  |  |  |
Management employees |  | $ | - |  | $ | - |  | $ | - |
Employees — common stock |  |  | 3.23 |  |  | 3.13 |  |  | 3.39 |
Overall weighted average |  |  | 3.23 |  |  | 3.13 |  |  | 3.39 |
Options granted with an exercise price above market price on the date of grant: |  |  |  |  |  |  |  |  |  |
Management employees |  | $ | - |  | $ | - |  | $ | - |
Employees — preferred stock |  |  | - |  |  | - |  |  | - |
Overall weighted average |  |  | - |  |  | - |  |  | - |
Total intrinsic value of options exercised |  | $ | 8,942 |  | $ | 73,753 |  | $ | 87,371 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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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- 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. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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