Stock-Based Compensation (Details 1) - Stock options [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Summary of all stock option plans
Number of Options Outstanding, Beginning Balance | shares	1,756,000
Number of Options Outstanding, Cancelled | shares	(111,111)
Number of Options Outstanding, Expired | shares	(260,000)
Number of Options Outstanding, Ending Balance | shares	1,384,889
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 4.20
Weighted Average Exercise Price, Cancelled | $ / shares	4.02
Weighted Average Exercise Price, Expired | $ / shares	4.15
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	$ 4.22