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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] | In calculating the fair value of the warrants using the Black-Scholes model, the following assumptions were utilized:
Expected life (in years) |  | 2 |
Volatility |  | 68 | %
Risk-free interest rate |  | 1.23 | %
Expected dividend rate |  | - |
Schedule of Share-based Compensation, Activity [Table Text Block] | A summary of the status of the Company’s non-vested stock options at December 31 and changes during the year is as follows:
|  | 2017 |  | 2016 |
|  | Number of Options |  | Weighted Average Grant Date Fair Value |  | Number of Options |  | Weighted Average Grant Date Fair Value |
Non-vested stock options at January 1 |  |  | 335,283 |  | $ | 5.09 |  |  | 466,009 |  | $ | 5.79 |
Granted |  |  | 127,000 |  | $ | 3.69 |  |  | 171,900 |  | $ | 4.22 |
Vested |  |  | (207,457) |  | $ | 5.16 |  |  | (290,141) |  | $ | 5.67 |
Exercised |  |  | - |  |  | - |  |  | - |  |  | - |
Forfeited/Expired/Exchanged |  |  | (15,955) |  | $ | 5.15 |  |  | (12,485) |  | $ | 6.17 |
Non-vested stock options at December 31 |  |  | 238,871 |  | $ | 4.27 |  |  | 335,283 |  | $ | 5.09 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following weighted-average assumptions were utilized in the calculation of the fair value of the stock options:
Expected life |  | 6.25 years |
Weighted average volatility |  | 69 | %
Forfeiture rate |  | 14 | %
Weighted average risk-free interest rate |  | 1.94 | %
Expected dividend rate |  | 0 | %
Schedule Of Employee Service Share Based Compensation Unrecognized Period Costs [Table Text Block] | At December 31, 2017, there was $436,000 of total unrecognized compensation cost related to non-vested stock option-based compensation arrangements granted under the Plan. That cost is expected to be recognized in future years as follows:
2018 |  | $ | 211,000 |
2019 |  |  | 144,000 |
2020 |  |  | 69,000 |
2021 |  |  | 12,000 |
|  | $ | 436,000 |
Schedule Of Recognized Compensation Cost [Table Text Block] | The recognized compensation cost associated with the Plan is as follows:
|  | 2017 |  | 2016 |
Research and development |  | $ | 119,000 |  | $ | 112,000 |
General and administrative |  |  | 250,000 |  |  | 513,000 |
Effect on net loss |  | $ | 369,000 |  | $ | 625,000 |
Effect on net loss per share |  | $ | 0.02 |  | $ | 0.05 |
Schedule Of Share Based Compensation Warrants Activity [Table Text Block] | The following table summarizes the number of warrants, the weighted average exercise price, and weighted average life (in years) by price for both total outstanding warrants and total exercisable warrants at December 31, 2017:
|  | Total Outstanding Warrants |
Exercise Price |  | Warrants |  | Wtd. Avg. Exercise Price |  | Remaining Life (in years) |
$1.80 |  |  | 80,000 |  | $ | 1.80 |  |  | 3.13 |
$4.00 |  |  | 2,395,471 |  | $ | 4.00 |  |  | 1.07 |
$10.00 |  |  | 20,313 |  | $ | 10.00 |  |  | 1.18 |
|  |  | 2,495,784 |  | $ | 3.98 |  |  |  |
Equity Incentive Plan [Member] |
Schedule of Share-based Compensation, Activity [Table Text Block] | Activity under the Plan is as follows:
|  | 2017 |  | 2016 |
Reserved but unissued shares under the Plan, beginning of year |  |  | 266,884 |  |  | 455,372 |
Increases in the number of authorized shares under the Plan |  |  | 255,261 |  |  | 15,039 |
Grants of stock options |  |  | (127,000) |  |  | (171,900) |
Stock option forfeitures |  |  | 15,955 |  |  | 12,485 |
Exercise of stock options |  |  | - |  |  | - |
Stock grants |  |  | (219,444) |  |  | (44,112) |
Reserved but unissued shares under the Plan, end of year |  |  | 191,656 |  |  | 266,884 |
Consultant Plan [Member] |
Schedule of Share-based Compensation, Activity [Table Text Block] | Activity under the Consultant Plan is as follows:
|  | 2017 |  | 2016 |
Reserved but unissued shares under the Consultant Plan at January 1 |  |  | 83,633 |  |  | 92,130 |
Increases in the number of authorized shares under the Consultant Plan |  |  | 25,526 |  |  | 1,503 |
Stock grants |  |  | (10,000) |  |  | (10,000) |
Reserved but unissued shares under the Consultant Plan at Period End |  |  | 99,159 |  |  | 83,633 |
Warrant [Member] |
Schedule Of Share Based Compensation Warrants Activity [Table Text Block] | A summary of the Company’s warrant activity and related information is as follows:
|  | 2017 |  | 2016 |
|  | Warrants |  | Average Exercise Price |  | Warrants |  | Average Exercise Price |
Outstanding at January 1 |  |  | 445,313 |  | $ | 4.65 |  |  | 564,272 |  | $ | 4.14 |
Granted |  |  | 2,395,471 |  | $ | 4.00 |  |  | - |  |  | - |
Exercised |  |  | - |  |  | - |  |  | (118,959) |  | $ | 2.20 |
Forfeited/Expired |  |  | (345,000) |  | $ | 5.00 |  |  | - |  |  | - |
Outstanding at Period End |  |  | 2,495,784 |  | $ | 3.98 |  |  | 445,313 |  | $ | 4.65 |
Employee Stock Option [Member] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of the Company’s stock option activity and related information is as follows:
|  | 2017 |  | 2016 |
|  | Options to Purchase Common Stock |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Options to Purchase Common Stock |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |
Outstanding at January 1 |  |  | 882,815 |  | $ | 4.98 |  |  | 7.51 |  |  | 723,400 |  | $ | 5.18 |  |  | 8.10 |
Granted |  |  | 127,000 |  | $ | 3.69 |  |  | 9.48 |  |  | 171,900 |  | $ | 4.22 |  |  | 9.26 |
Exercised |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |
Forfeited/Expired/Exchanged |  |  | (15,955) |  | $ | 5.15 |  |  | - |  |  | (12,485) |  | $ | 6.17 |  |  | - |
Outstanding at December 31 |  |  | 993,860 |  | $ | 4.81 |  |  | 6.94 |  |  | 882,815 |  | $ | 4.98 |  |  | 7.51 |
Exercisable at December 31 |  |  | 754,989 |  | $ | 4.98 |  |  | 6.32 |  |  | 547,532 |  | $ | 4.91 |  |  | 6.85 |

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