Stock-Based Compensation (Details 1) - Employee Stock Option [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of all stock option plans / warrant activity
Number of Shares/Warrants, Options outstanding and exercisable, Beginning Balance	99,800	175,600
Number of Shares, Options granted
Number of Shares, Options exercised
Number of Shares, Options cancelled or expired	(47,300)	(105,800)
Number of Shares/Warrants, Options outstanding and exercisable Ending Balance	52,500	99,800	175,600
Weighted Average Exercise Price, Options outstanding and exercisable, Beginning Balance	$ 34.55	$ 41.99
Weighted Average Exercise Price, Options granted		15.00
Weighted Average Exercise Price, Options exercised
Weighted Average Exercise Price, Options cancelled or expired	42.35	41.36
Weighted Average Exercise Price, Options outstanding and exercisable, Ending Balance	$ 27.51	$ 34.55	$ 41.99
Options outstanding, Weighted Average Remaining Contractual Life (years)	1 year 4 months 13 days	1 year 4 months 28 days	2 years 2 months 5 days
Options outstanding, Aggregate Intrinsic Value
Options exercisable and expected to vest, Aggregate Intrinsic Value