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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award Options and Warrants Vested and Expected to Vest Outstanding and Exercisable [Table Text Block] | The assumptions used for the nine months ended September 30, 2017 are as follows:
Exercise price |  |  | $29.05-$30.45
Expected dividends |  |  | 0%
Expected volatility |  |  | 90%-92%
Risk free interest rate |  |  | 1.67%-1.75%
Expected life of option |  |  | 4.2-4.3 years
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock option activities for the nine months ended September 30, 2018 is as follows:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value |
Balance - December 31, 2016 |  |  | 332,561 |  |  | $ | 61.87 |  |  | 5.49 years |  | $ | 194,355 |
Granted |  |  | 90,286 |  |  | $ | 20.12 |  |  |  |  |  |  |
Exercised |  |  | (11,966 | ) |  | $ | 13.89 |  |  |  |  | $ | 163,050 |
Expired |  |  | (19,091 | ) |  | $ | 77.46 |  |  |  |  |  |  |
Forfeited |  |  | (32,714 | ) |  | $ | 42.21 |  |  |  |  |  |  |
Balance - December 31, 2017 |  |  | 359,076 |  |  | $ | 53.93 |  |  | 4.60 years |  | $ | 1,800 |
Granted |  |  | - |  |  | $ | - |  |  |  |  |  |  |
Exercised |  |  | - |  |  | $ | - |  |  |  |  | $ | - |
Expired |  |  | (8,124 | ) |  | $ | 53.27 |  |  |  |  |  |  |
Forfeited |  |  | (3,187 | ) |  | $ | 27.28 |  |  |  |  |  |  |
Balance - September 30, 2018 - outstanding |  |  | 347,765 |  |  | $ | 54.19 |  |  | 3.90 years |  | $ | - |
Balance - September 30, 2018 - exercisable |  |  | 257,985 |  |  | $ | 64.63 |  |  | 3.21 years |  | $ | - |
Grant date fair value of options granted - September 30, 2018 |  |  |  |  |  | $ | - |  |  |  |  |  |  |
Weighted average grant date fair value - September 30, 2018 |  |  |  |  |  | $ | - |  |  |  |  |  |  |

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- Definition Tabular disclosure relates to share based compensation arrangement by share based payment award options and warrants vested and expected to vest outstanding and exercisable. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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