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Acquisitions (Schedule of Statements of Financial Condition) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
ASSETS |  |  |  |  |
Cash and cash equivalents |  | $ 4,536,000 | $ 4,670,000 | [1] | $ 5,883,000
Cash and securities segregated for regulatory purposes |  | 263,980,000 | 224,924,000 | [1] | $ 194,369,000
Receivables from customers |  | 91,842,000 | 86,331,000 | [1] |
Receivables from broker-dealers and clearing organizations |  | 3,312,000 | 3,524,000 | [1] |
Other receivables |  | 873,000 | 762,000 | [1] |
Prepaid expenses and other assets |  | 1,444,000 | 970,000 | [1] |
Securities borrowed |  | 283,757,000 | 193,529,000 | [1] |
Securities owned, at fair value |  | 3,480,000 | 3,018,000 | [1] |
Total Current assets |  | 653,224,000 | 517,728,000 | [1] |
Deposits with broker-dealers and clearing organizations |  | 5,094,000 | 4,951,000 | [1] |
Furniture, equipment and leasehold improvements, net |  | 850,000 | 1,150,000 | [1] |
Software, net |  | 1,503,000 | 1,888,000 | [1] |
Lease right-of-use assets |  | 2,813,000 | 3,951,000 | [1] |
Deferred tax assets |  | 5,239,000 | 5,388,000 | [1] |
Intangible assets, net |  | 850,000 | 1,022,000 | [1] |
Goodwill |  | 1,989,000 | 1,989,000 | [1] |
Total Assets |  | 673,452,000 | 538,067,000 | [1] |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |
Payables to customers |  | 342,156,000 | 308,091,000 | [1] |
Payables to non-customers |  | 9,346,000 | 8,063,000 | [1] |
Drafts payable |  | 1,635,000 | 2,834,000 | [1] |
Payables to broker-dealers and clearing organizations |  | 356,000 | 523,000 | [1] |
Accounts payable and accrued liabilities |  | 2,754,000 | 2,443,000 | [1] |
Securities loaned |  | 266,777,000 | 170,443,000 | [1] |
Securities sold, not yet purchased, at fair value |  | 25,000 | 116,000 | [1] |
Interest payable |  |  | 10,000 | [1] |
Current portion of lease liabilities |  | 1,633,000 | 2,227,000 | [1] |
Total Current liabilities |  | 628,679,000 | 502,750,000 | [1] |
Lease liabilities, less current portion |  | 1,548,000 | 2,182,000 | [1] |
Total Liabilities |  | 637,134,000 | 504,932,000 | [1] |
Commitments and Contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $.01 par value | [2] | 306,000 | 304,000 | [1] |
Additional paid-in capital |  | 21,022,000 | 19,897,000 | [1] |
Retained earnings |  | 14,990,000 | 12,934,000 | [1] |
Total Stockholders' equity |  | 36,318,000 | 33,135,000 | [1] |
Total Liabilities and stockholders' equity |  | $ 673,452,000 | 538,067,000 | [1] |
Siebert [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Cash and cash equivalents |  |  | 3,082,000 |  |
Cash and securities segregated for regulatory purposes |  |  | 110,000 |  |
Receivables from customers |  |  |  |  |
Receivables from broker-dealers and clearing organizations |  |  | 3,067,000 |  |
Receivables from related party |  |  | 1,000,000 |  |
Other receivables |  |  | 223,000 |  |
Prepaid expenses and other assets |  |  | 624,000 |  |
Securities borrowed |  |  |  |  |
Securities owned, at fair value |  |  |  |  |
Total Current assets |  |  | 8,106,000 |  |
Deposits with broker-dealers and clearing organizations |  |  | 3,186,000 |  |
Furniture, equipment and leasehold improvements, net |  |  | 1,131,000 |  |
Software, net |  |  | 1,888,000 |  |
Lease right-of-use assets |  |  | 2,810,000 |  |
Equity method investment in related party |  |  | 3,360,000 |  |
Deferred tax assets |  |  | 4,981,000 |  |
Intangible assets, net |  |  | 1,022,000 |  |
Goodwill |  |  | 1,989,000 |  |
Total Assets |  |  | 28,473,000 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |
Payables to customers |  |  |  |  |
Payables to non-customers |  |  |  |  |
Drafts payable |  |  |  |  |
Payables to broker-dealers and clearing organizations |  |  |  |  |
Payables to related parties |  |  | 7,000 |  |
Accounts payable and accrued liabilities |  |  | 1,473,000 |  |
Securities loaned |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  | 88,000 |  |
Interest payable |  |  | 10,000 |  |
Notes payable - related party |  |  | 3,000,000 |  |
Current portion of lease liabilities |  |  | 1,291,000 |  |
Total Current liabilities |  |  | 5,869,000 |  |
Lease liabilities, less current portion |  |  | 1,823,000 |  |
Total Liabilities |  |  | 7,692,000 |  |
Commitments and Contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $.01 par value |  |  | 271,000 |  |
Additional paid-in capital |  |  | 7,641,000 |  |
Retained earnings |  |  | 12,869,000 |  |
Total Stockholders' equity |  |  | 20,781,000 |  |
Total Liabilities and stockholders' equity |  |  | 28,473,000 |  |
StockCross [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Cash and cash equivalents |  |  | 1,588,000 |  |
Cash and securities segregated for regulatory purposes |  |  | 224,814,000 |  |
Receivables from customers |  |  | 86,331,000 |  |
Receivables from broker-dealers and clearing organizations |  |  | 1,265,000 |  |
Receivables from related party |  |  |  |  |
Other receivables |  |  | 627,000 |  |
Prepaid expenses and other assets |  |  | 346,000 |  |
Securities borrowed |  |  | 193,529,000 |  |
Securities owned, at fair value |  |  | 3,018,000 |  |
Total Current assets |  |  | 511,518,000 |  |
Deposits with broker-dealers and clearing organizations |  |  | 1,840,000 |  |
Furniture, equipment and leasehold improvements, net |  |  | 19,000 |  |
Software, net |  |  |  |  |
Lease right-of-use assets |  |  | 1,141,000 |  |
Equity method investment in related party |  |  |  |  |
Deferred tax assets |  |  | 407,000 |  |
Intangible assets, net |  |  |  |  |
Goodwill |  |  |  |  |
Total Assets |  |  | 514,925,000 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |
Payables to customers |  |  | 308,091,000 |  |
Payables to non-customers |  |  | 9,151,000 |  |
Drafts payable |  |  | 2,834,000 |  |
Payables to broker-dealers and clearing organizations |  |  | 1,406,000 |  |
Payables to related parties |  |  |  |  |
Accounts payable and accrued liabilities |  |  | 963,000 |  |
Securities loaned |  |  | 170,443,000 |  |
Securities sold, not yet purchased, at fair value |  |  | 28,000 |  |
Interest payable |  |  |  |  |
Notes payable - related party |  |  | 5,000,000 |  |
Current portion of lease liabilities |  |  | 936,000 |  |
Total Current liabilities |  |  | 498,852,000 |  |
Lease liabilities, less current portion |  |  | 359,000 |  |
Total Liabilities |  |  | 499,211,000 |  |
Commitments and Contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $.01 par value |  |  | 10,000 |  |
Additional paid-in capital |  |  | 12,436,000 |  |
Retained earnings |  |  | 3,268,000 |  |
Total Stockholders' equity |  |  | 15,714,000 |  |
Total Liabilities and stockholders' equity |  |  | 514,925,000 |  |
Pro Forma Adjustments (unaudited) [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Cash and cash equivalents |  |  |  |  |
Cash and securities segregated for regulatory purposes |  |  |  |  |
Receivables from customers |  |  |  |  |
Receivables from broker-dealers and clearing organizations |  |  | (808,000) |  |
Receivables from related party |  |  | (1,000,000) |  |
Other receivables |  |  | (88,000) |  |
Prepaid expenses and other assets |  |  |  |  |
Securities borrowed |  |  |  |  |
Securities owned, at fair value |  |  |  |  |
Total Current assets |  |  | (1,896,000) |  |
Deposits with broker-dealers and clearing organizations |  |  | (75,000) |  |
Furniture, equipment and leasehold improvements, net |  |  |  |  |
Software, net |  |  |  |  |
Lease right-of-use assets |  |  |  |  |
Equity method investment in related party |  |  | (3,360,000) |  |
Deferred tax assets |  |  |  |  |
Intangible assets, net |  |  |  |  |
Goodwill |  |  |  |  |
Total Assets |  |  | (5,331,000) |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |
Payables to customers |  |  |  |  |
Payables to non-customers |  |  | (1,088,000) |  |
Drafts payable |  |  |  |  |
Payables to broker-dealers and clearing organizations |  |  | (883,000) |  |
Payables to related parties |  |  | (7,000) |  |
Accounts payable and accrued liabilities |  |  | 7,000 |  |
Securities loaned |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |
Interest payable |  |  |  |  |
Notes payable - related party |  |  |  |  |
Current portion of lease liabilities |  |  |  |  |
Total Current liabilities |  |  | (1,971,000) |  |
Lease liabilities, less current portion |  |  |  |  |
Total Liabilities |  |  | (1,971,000) |  |
Commitments and Contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $.01 par value |  |  | 23,000 |  |
Additional paid-in capital |  |  | (180,000) |  |
Retained earnings |  |  | (3,203,000) |  |
Total Stockholders' equity |  |  | (3,360,000) |  |
Total Liabilities and stockholders' equity |  |  | (5,331,000) |  |
Total Combined Siebert (unaudited) [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Cash and cash equivalents |  |  | 4,670,000 |  |
Cash and securities segregated for regulatory purposes |  |  | 224,924,000 |  |
Receivables from customers |  |  | 86,331,000 |  |
Receivables from broker-dealers and clearing organizations |  |  | 3,524,000 |  |
Receivables from related party |  |  |  |  |
Other receivables |  |  | 762,000 |  |
Prepaid expenses and other assets |  |  | 970,000 |  |
Securities borrowed |  |  | 193,529,000 |  |
Securities owned, at fair value |  |  | 3,018,000 |  |
Total Current assets |  |  | 517,728,000 |  |
Deposits with broker-dealers and clearing organizations |  |  | 4,951,000 |  |
Furniture, equipment and leasehold improvements, net |  |  | 1,150,000 |  |
Software, net |  |  | 1,888,000 |  |
Lease right-of-use assets |  |  | 3,951,000 |  |
Equity method investment in related party |  |  |  |  |
Deferred tax assets |  |  | 5,388,000 |  |
Intangible assets, net |  |  | 1,022,000 |  |
Goodwill |  |  | 1,989,000 |  |
Total Assets |  |  | 538,067,000 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |  |
Payables to customers |  |  | 308,091,000 |  |
Payables to non-customers |  |  | 8,063,000 |  |
Drafts payable |  |  | 2,834,000 |  |
Payables to broker-dealers and clearing organizations |  |  | 523,000 |  |
Payables to related parties |  |  |  |  |
Accounts payable and accrued liabilities |  |  | 2,443,000 |  |
Securities loaned |  |  | 170,443,000 |  |
Securities sold, not yet purchased, at fair value |  |  | 116,000 |  |
Interest payable |  |  | 10,000 |  |
Notes payable - related party |  |  | 8,000,000 |  |
Current portion of lease liabilities |  |  | 2,227,000 |  |
Total Current liabilities |  |  | 502,750,000 |  |
Lease liabilities, less current portion |  |  | 2,182,000 |  |
Total Liabilities |  |  | 504,932,000 |  |
Commitments and Contingencies |  |  |  |  |
Stockholders' equity |  |  |  |  |
Common stock, $.01 par value |  |  | 304,000 |  |
Additional paid-in capital |  |  | 19,897,000 |  |
Retained earnings |  |  | 12,934,000 |  |
Total Stockholders' equity |  |  | 33,135,000 |  |
Total Liabilities and stockholders' equity |  |  | $ 538,067,000 |  |
[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.
[2] | Shares outstanding as of December 31, 2019 represents the combined total of the Company's shares outstanding and the shares issued for the Company's acquisition of StockCross. See "Note 1 - Organization and Basis of Presentation" for additional detail.

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