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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Stockholders' Equity Note [Abstract]  
Schedule Of Share Based Compensation Warrants Activity [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
 
71%
 
Forfeiture rate
 
13%
 
Weighted average risk-free interest rate
 
2.74%
 
Expected dividend rate
 
0%
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The Company has the following warrants outstanding at June 30, 2018:
 
Total Outstanding Warrants
 
Exercise Price
 
 
Warrants
 
 
Wtd. Avg.
Exercise
Price
 
 
Remaining
Life
(in years)
 
$
1.80
 
 
 
80,000
 
 
$
1.80
 
 
 
2.64
 
$
4.00
 
 
 
2,395,471
 
 
$
4.00
 
 
 
0.57
 
$
10.00
 
 
 
20,313
 
 
$
10.00
 
 
 
0.68
 
 
 
 
 
 
2,495,784
 
 
$
3.98