Investments, Available-for-sale securities (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Investment Securities [Abstract]
Balance	$ 97,074	$ 98,784
4GRIT [Member]
Investment Securities [Abstract]
Balance	$ 43,948	$ 44,723
Percentage of ownership	2.50%	2.50%
E-channel [Member]
Investment Securities [Abstract]
Balance	$ 41,567	$ 42,299
Percentage of ownership	0.07%	0.07%
KSFC [Member]
Investment Securities [Abstract]
Balance	$ 11,558	$ 11,762
Percentage of ownership	0.00%	0.00%