Leases (Schedule of Supplemental Balance Sheet Information Related to Leases) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Assets
Lease right-of-use assets	$ 3,430,000	$ 3,951,000	[1]
Liabilities
Lease liabilities	$ 3,845,000	$ 4,409,000

[1] Statement of financial condition as of December 31, 2019 represents the pro forma combination of Siebert and StockCross balances. See "Note 3 - Acquisitions" for additional detail.