Net Income / (Loss) Per Common Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

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

Potential common shares outstanding as of March 31, 2017 and 2016:

	March 31, 2017		March 31, 2016
Warrants		2,060,000		2,385,000
Options		2,107,000		2,185,000
		4,167,000		4,570,000