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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Options activity under the stock-based compensation plans as of March 31, 2015 and changes during the three months ended March 31, 2015 were as follows:
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2014 |  |  | 882,657 |  |  | $ | 5.65 |  |  |  |  |  |  |  |  |
Exercised |  |  | (110,500 | ) |  | $ | 3.85 |  |  |  |  |  |  |  |  |
Canceled/expired |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | (3,362 | ) |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2015 |  |  | 768,795 |  |  | $ | 5.87 |  |  |  | 2.67 |  |  | $ | 10,273,607 |
Exercisable at March 31, 2015 |  |  | 763,028 |  |  | $ | 5.80 |  |  |  | 2.62 |  |  | $ | 10,244,830 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The fair value of the stock granted was based on the closing market price of its common stock as of the grant date. Generally, grants of restricted shares vest one-third, each, on the first, second and third anniversaries of the grant date
|  | Nonvested Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested at December 31, 2014 |  |  | 50,203 |  |  | $ | 11.79 |
Granted |  |  | 59,466 |  |  |  | 18.47 |
Vested |  |  | (20,565 | ) |  |  | 10.76 |
Forfeited/cancelled/expired |  |  | — |  |  |  | — |
Outstanding at March 31, 2015 |  |  | 89,104 |  |  | $ | 16.43 |

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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=6415400&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=6415400&loc=d3e5047-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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