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Receivables from and Payable to Clearing Broker Dealers and Related Parties (Schedule of Amounts Receivable) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Receivables from clearing broker dealers
NFS	$ 1,328,000	$ 1,664,000
StockCross	883,000	310,000
Goldman Sachs	2,841,000
Pershing Capital	1,192,000
Other receivables	9,000	56,000
Receivables from clearing broker dealers	6,253,000	2,030,000
Receivable from related party
StockCross	1,000,000	1,000,000
Total Receivable from related party	1,000,000	1,000,000
Due to clearing brokers and related parties
NFS		58,000
StockCross	7,000	46,000
MSCO		29,000
Total Due to clearing brokers and related parties	$ 7,000	$ 133,000

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