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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table summarizes potentially dilutive securities outstanding at December 31, 2017, 2016, and 2015 that were excluded from the computation of diluted net loss per share, as they would be anti-dilutive:

	December 31,
	2017		2016		2015
Warrants (Note 7)		4,326,555		4,331,106		4,286,782
Stock options (Note 7)		60,000		60,000		-
Unvested restricted stock (Note 7)		2,611,116		2,533,063		2,500,000
Total		6,997,671		6,924,169		6,786,782