Capital Requirements (Narrative) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets	$ 18,177,000	$ 6,025,000
Cash and cash equivalents	7,229,000	3,765,000	$ 2,730,000
MSCO [Member]
Net capital	8,900,000	4,400,000
Minimum net capital required	250,000	250,000
Net capital in excess of minimum requirement	$ 8,700,000	$ 4,200,000