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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | Option activity under the Company’s option plans as of and for the six months ended June 30, 2017 were as follows:
|  |  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  |  |  | Average |  |  |
|  |  |  |  | Weighted- |  | Remaining |  |  |
|  |  |  |  | Average |  | Contractual |  |  |
|  |  |  |  | Exercise |  | Term |  | Aggregate
|  | Shares |  | Price |  | (In Years) |  | Intrinsic Value
Outstanding at December 31, 2016 |  | 358,367 |  |  | $ | 6.26 |  |  |  |  |
Granted |  | - |  |  |  | - |  |  |  |  |
Exercised |  | (10,846 | ) |  |  | 13.44 |  |  |  |  |
Forfeited/cancelled/expired |  | - |  |  |  | - |  |  |  |  |
Outstanding at June 30, 2017 |  | 347,521 |  |  | $ | 6.11 |  | 2.20 |  | $ | 5,711,643
Exercisable at June 30, 2017 |  | 343,991 |  |  | $ | 6.03 |  | 2.16 |  | $ | 5,682,309
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The below table represents information regarding restricted shares currently outstanding at June 30, 2017:
|  |  |  | Weighted-
|  |  |  | Average
| Nonvested |  | Grant Date
| Shares |  | Fair Value
Nonvested at December 31, 2016 | 111,273 |  |  | $ | 16.81
Granted | 56,164 |  |  |  | 23.82
Vested | (65,359 | ) |  |  | 16.46
Forfeited/cancelled/expired | - |  |  |  | -
Nonvested at June 30, 2017 | 102,078 |  |  | $ | 20.41
Schedule of Unearned Performance Unit Awards [Table Text Block] | A summary of the status of unearned performance unit awards and the change during the period is presented in the table below:
|  |  |  |  |  |  | Weighted
|  |  |  |  |  |  | Average Grant
|  | Units |  | Units |  | Date Fair
|  | (expected) |  | (maximum) |  | Value
Unearned at December 31, 2016 |  | 151,572 |  |  | 189,455 |  | $ | 18.47
Awarded |  | 24,891 |  |  | 37,336 |  |  | 22.75
Forfeited |  | - |  |  | - |  |  | -
Adjustments |  | (25,269 | ) |  | - |  |  | 18.47
Unearned at June 30, 2017 |  | 151,194 |  |  | 226,791 |  | $ | 19.19

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -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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