Summary of Significant Accounting Policies (Details 4) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Average market price of common shares	2,528,000	1,834,000
Average market price of common shares including potential shares was anti-dilutive	10,000	187,000
Warrants [Member]
Average market price of common shares	1,960,000	1,480,000
Average market price of common shares including potential shares was anti-dilutive	7,000	41,000
Stock Options [Member]
Average market price of common shares	568,000	354,000
Average market price of common shares including potential shares was anti-dilutive	3,000	146,000