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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Margin interest, marketing and distribution fees | $ 11,121,000 | $ 10,928,000
Total Revenue from Principal transactions | 8,061,000 | 9,020,000
Total Revenue from Commissions and fees | 8,302,000 | 9,504,000
Total Revenue from Interest | 308,000 | 106,000
Total revenue | 28,593,000 | 30,036,000
Legacy Siebert [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Advisory fees | 801,000 | 478,000
Total Revenue from Interest | 308,000 | 106,000
Margin interest, marketing and distribution fees [Member] | Legacy Siebert [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Margin interest, marketing and distribution fees | 9,723,000 | 9,674,000
Margin interest, marketing and distribution fees [Member] | StockCross accounts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Margin interest, marketing and distribution fees | 1,398,000 | 1,254,000
Principal transactions [Member] | Legacy Siebert [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Principal transactions | 2,154,000 | 1,894,000
Principal transactions [Member] | StockCross accounts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Principal transactions | 5,907,000 | 7,126,000
Commissions and fees [Member] | Legacy Siebert [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Commissions and fees | 7,037,000 | 7,792,000
Commissions and fees [Member] | StockCross accounts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue from Commissions and fees | $ 1,265,000 | $ 1,712,000

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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