Investments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	May 31, 2018
Schedule Of Investments [Line Items]
Corporate Investment	$ 50,324	$ 65,781
Unrealized Gain (Loss) on Investments	3,296
Long-term Investments	8,154	$ 5,425
Unrealized Gain on Securities	827
Long Term Investments, Cost, in a private company.			$ 5,400
Long Term Investment, at Cost, in a private investment fund	300
Long Term Investment, at Cost, in Private Equity	3,400
Unrealized gain on private equity investment	600
UCITS Fund
Schedule Of Investments [Line Items]
Corporate Investment	$ 0