Redeemable Series G Convertible Preferred Stock (Details Textual)	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Temporary Equity [Line Items]
Preferred Stock, Shares Authorized | shares	1,000,000
Series G Preferred Stock [Member]
Temporary Equity [Line Items]
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 1,000
Convertible Preferred Stock, Terms of Conversion	conversion price equal to 85% of the lowest sale price of the common stock on its listed market over the five trading days preceding the date of conversion (“Beneficial Conversion Feature”), subject to a maximum conversion price.
Preferred Stock, Shares Outstanding | shares	150,175
Preferred Stock, Liquidation Preference Per Share | $ / shares	$ 1,000
Preferred Stock, Liquidation Preference, Value | $	$ 168,496