Net Loss Per Common Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Basic net loss per common share is calculated by dividing the net loss by the weighted average number of outstanding common shares during the period. Diluted net loss per common share includes the weighted average dilutive effect of stock options and warrants. Potential common shares outstanding as of June 30, 2017 and 2016:

	June 30, 2017		June 30, 2016
Warrants		2,060,000		2,385,000
Options		2,147,000		2,187,000
		4,207,000		4,572,000