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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Schedule Of Share Based Compensation Warrants Activity [Table Text Block]
The Company has the following warrants outstanding at March 31, 2017:
 
Exercise Price
 
Warrants
 
Wtd. Avg.
Exercise
Price
 
Remaining
Life
(in years)
 
$
1.80
 
 
80,000
 
$
1.80
 
 
3.88
 
$
4.00
 
 
2,395,471
 
$
4.00
 
 
1.82
 
$
5.00
 
 
345,000
 
$
5.00
 
 
0.07
 
$
10.00
 
 
20,313
 
$
10.00
 
 
1.93
 
 
 
 
 
2,840,784
 
$
4.10
 
 
 
 
Warrant [Member]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following weighted-average assumptions were utilized for the calculations:
 
Expected life (in years)
 
 
2
 
Volatility
 
 
68%
 
Risk-free interest rate
 
 
1.23%
 
Expected dividend rate
 
 
-