| Segment Reporting [Table Text Block] |
| | | Capital | | | Asset | | | Principal | | | Segment | | | Unallocated | | | | | |
| | | Markets | | | Management | | | Investing | | | Total | | | (1) | | | Total | |
| Investment banking and new issue | | $ | 99,770 | | | $ | - | | | $ | - | | | $ | 99,770 | | | $ | - | | | $ | 99,770 | |
| Net trading | | | 27,088 | | | | - | | | | - | | | | 27,088 | | | | - | | | | 27,088 | |
| Asset management | | | - | | | | 4,256 | | | | - | | | | 4,256 | | | | - | | | | 4,256 | |
| Principal transactions | | | - | | | | - | | | | (4,641 | ) | | | (4,641 | ) | | | - | | | | (4,641 | ) |
| Other income | | | 1 | | | | 650 | | | | 265 | | | | 916 | | | | - | | | | 916 | |
| Total revenues | | | 126,859 | | | | 4,906 | | | | (4,376 | ) | | | 127,389 | | | | - | | | | 127,389 | |
| Compensation and benefits | | | 78,458 | | | | 3,388 | | | | 60 | | | | 81,906 | | | | 7,586 | | | | 89,492 | |
| Business development | | | 1,853 | | | | 144 | | | | - | | | | 1,997 | | | | 623 | | | | 2,620 | |
| Occupancy and equipment | | | 1,626 | | | | 114 | | | | - | | | | 1,740 | | | | 614 | | | | 2,354 | |
| Subscriptions, clearing, and execution | | | 7,230 | | | | 173 | | | | - | | | | 7,403 | | | | 122 | | | | 7,525 | |
| Professional fee and other operating | | | 3,912 | | | | 1,072 | | | | 50 | | | | 5,034 | | | | 2,402 | | | | 7,436 | |
| Depreciation and amortization | | | - | | | | 3 | | | | - | | | | 3 | | | | 417 | | | | 420 | |
| Total operating expenses | | | 93,079 | | | | 4,894 | | | | 110 | | | | 98,083 | | | | 11,764 | | | | 109,847 | |
| Operating income (loss) | | | 33,780 | | | | 12 | | | | (4,486 | ) | | | 29,306 | | | | (11,764 | ) | | | 17,542 | |
| Interest expense | | | (89 | ) | | | - | | | | - | | | | (89 | ) | | | (2,557 | ) | | | (2,646 | ) |
| Income (loss) from equity method affiliates | | | (991 | ) | | | - | | | | (2,574 | ) | | | (3,565 | ) | | | - | | | | (3,565 | ) |
| Income (loss) before income taxes | | | 32,700 | | | | 12 | | | | (7,060 | ) | | | 25,652 | | | | (14,321 | ) | | | 11,331 | |
| Income tax expense (benefit) | | | - | | | | 257 | | | | - | | | | 257 | | | | (298 | ) | | | (41 | ) |
| Net income (loss) | | | 32,700 | | | | (245 | ) | | | (7,060 | ) | | | 25,395 | | | | (14,023 | ) | | | 11,372 | |
| Less: Net income (loss) attributable to the non-convertible non-controlling interest of the Operating LLC | | | - | | | | - | | | | (2,776 | ) | | | (2,776 | ) | | | - | | | | (2,776 | ) |
| Enterprise net income (loss) | | | 32,700 | | | | (245 | ) | | | (4,284 | ) | | | 28,171 | | | | (14,023 | ) | | | 14,148 | |
| Less: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc. | | | - | | | | - | | | | - | | | | - | | | | 9,082 | | | | 9,082 | |
| Net income (loss) attributable to Cohen & Company Inc. | | $ | 32,700 | | | $ | (245 | ) | | $ | (4,284 | ) | | $ | 28,171 | | | $ | (23,105 | ) | | $ | 5,066 | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| Other statement of operations data | | | | | | | | | | | | | | | | | | | | | | | | |
| Compensation and benefits as a percentage of revenue | | | 61.85 | % | | | 69.06 | % | | | (1.37 | )% | | | 64.30 | % | | | N/A | | | | 70.25 | % |
| Operating income / (loss) as a percentage of revenue | | | 26.63 | % | | | 0.24 | % | | | (102.51 | )% | | | 23.01 | % | | | N/A | | | | 13.77 | % |
| Net income / (loss) as a percentage of revenue | | | 25.78 | % | | | (4.99 | )% | | | (161.33 | )% | | | 19.94 | % | | | N/A | | | | 8.93 | % |
| Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue | | | 25.78 | % | | | (4.99 | )% | | | (97.90 | )% | | | 22.11 | % | | | N/A | | | | 3.98 | % |
| | | Capital | | | Asset | | | Principal | | | Segment | | | Unallocated | | | | | |
| | | Markets | | | Management | | | Investing | | | Total | | | (1) | | | Total | |
| Investment banking and new issue | | $ | 64,297 | | | $ | - | | | $ | - | | | $ | 64,297 | | | $ | - | | | $ | 64,297 | |
| Net trading | | | 19,968 | | | | - | | | | - | | | | 19,968 | | | | - | | | | 19,968 | |
| Asset management | | | - | | | | 4,188 | | | | - | | | | 4,188 | | | | - | | | | 4,188 | |
| Principal transactions | | | - | | | | - | | | | (148 | ) | | | (148 | ) | | | - | | | | (148 | ) |
| Other income | | | - | | | | 1,020 | | | | (714 | ) | | | 306 | | | | - | | | | 306 | |
| Total revenues | | | 84,265 | | | | 5,208 | | | | (862 | ) | | | 88,611 | | | | - | | | | 88,611 | |
| Compensation and benefits | | | 55,528 | | | | 2,807 | | | | 359 | | | | 58,694 | | | | 7,295 | | | | 65,989 | |
| Business development | | | 1,050 | | | | 115 | | | | 1 | | | | 1,166 | | | | 611 | | | | 1,777 | |
| Occupancy and equipment | | | 1,361 | | | | 106 | | | | - | | | | 1,467 | | | | 573 | | | | 2,040 | |
| Subscriptions, clearing, and execution | | | 4,204 | | | | 168 | | | | 30 | | | | 4,402 | | | | 104 | | | | 4,506 | |
| Professional fee and other operating | | | 3,788 | | | | 588 | | | | 262 | | | | 4,638 | | | | 1,715 | | | | 6,353 | |
| Depreciation and amortization | | | - | | | | 4 | | | | - | | | | 4 | | | | 340 | | | | 344 | |
| Total operating expenses | | | 65,931 | | | | 3,788 | | | | 652 | | | | 70,371 | | | | 10,638 | | | | 81,009 | |
| Operating income / (loss) | | | 18,334 | | | | 1,420 | | | | (1,514 | ) | | | 18,240 | | | | (10,638 | ) | | | 7,602 | |
| Interest expense | | | (40 | ) | | | - | | | | - | | | | (40 | ) | | | (2,904 | ) | | | (2,944 | ) |
| Gain on sale of management contracts | | | - | | | | 837 | | | | - | | | | 837 | | | | - | | | | 837 | |
| Income (loss) from equity method affiliates | | | (480 | ) | | | - | | | | 1,461 | | | | 981 | | | | - | | | | 981 | |
| Income (loss) before income taxes | | | 17,814 | | | | 2,257 | | | | (53 | ) | | | 20,018 | | | | (13,542 | ) | | | 6,476 | |
| Income tax expense (benefit) | | | - | | | | - | | | | - | | | | - | | | | 910 | | | | 910 | |
| Net income (loss) | | | 17,814 | | | | 2,257 | | | | (53 | ) | | | 20,018 | | | | (14,452 | ) | | | 5,566 | |
| Less: Net income (loss) attributable to the non-convertible non-controlling interest of the Operating LLC | | | - | | | | - | | | | (314 | ) | | | (314 | ) | | | - | | | | (314 | ) |
| Enterprise net income (loss) | | | 17,814 | | | | 2,257 | | | | 261 | | | | 20,332 | | | | (14,452 | ) | | | 5,880 | |
| Less: Net income (loss) attributable to the convertible non-controlling interest of Cohen & Company Inc. | | | - | | | | - | | | | - | | | | - | | | | 4,143 | | | | 4,143 | |
| Net income (loss) attributable to Cohen & Company Inc. | | $ | 17,814 | | | $ | 2,257 | | | $ | 261 | | | $ | 20,332 | | | $ | (18,595 | ) | | $ | 1,737 | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| Other statement of operations data | | | | | | | | | | | | | | | | | | | | | | | | |
| Compensation and benefits as a percentage of revenue | | | 65.90 | % | | | 53.90 | % | | | (41.65 | )% | | | 66.24 | % | | | N/A | | | | 74.47 | % |
| Operating income / (loss) as a percentage of revenue | | | 21.76 | % | | | 27.27 | % | | | (175.64 | )% | | | 20.58 | % | | | N/A | | | | 8.58 | % |
| Net income / (loss) as a percentage of revenue | | | 21.14 | % | | | 43.34 | % | | | (6.15 | )% | | | 22.59 | % | | | N/A | | | | 6.28 | % |
| Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue | | | 21.14 | % | | | 43.34 | % | | | 30.28 | % | | | 22.95 | % | | | N/A | | | | 1.96 | % |
| | | Capital | | | Asset | | | Principal | | | Segment | | | Unallocated | | | | | |
| | | Markets | | | Management | | | Investing | | | Total | | | (1) | | | Total | |
| Investment banking and new issue | | $ | 54,059 | | | $ | - | | | $ | - | | | $ | 54,059 | | | $ | - | | | $ | 54,059 | |
| Net trading | | | 13,888 | | | | - | | | | - | | | | 13,888 | | | | - | | | | 13,888 | |
| Asset management | | | - | | | | 1,837 | | | | - | | | | 1,837 | | | | - | | | | 1,837 | |
| Principal transactions | | | - | | | | - | | | | (726 | ) | | | (726 | ) | | | - | | | | (726 | ) |
| Other income | | | - | | | | 359 | | | | 70 | | | | 429 | | | | - | | | | 429 | |
| Total revenues | | | 67,947 | | | | 2,196 | | | | (656 | ) | | | 69,487 | | | | - | | | | 69,487 | |
| Compensation and benefits | | | 42,615 | | | | 1,572 | | | | 30 | | | | 44,217 | | | | 3,968 | | | | 48,185 | |
| Business development | | | 923 | | | | 46 | | | | - | | | | 969 | | | | 393 | | | | 1,362 | |
| Occupancy and equipment | | | 833 | | | | 57 | | | | - | | | | 890 | | | | 339 | | | | 1,229 | |
| Subscriptions, clearing, and execution | | | 3,429 | | | | 81 | | | | - | | | | 3,510 | | | | 63 | | | | 3,573 | |
| Professional fee and other operating | | | 1,093 | | | | 607 | | | | 35 | | | | 1,735 | | | | 777 | | | | 2,512 | |
| Depreciation and amortization | | | - | | | | 1 | | | | - | | | | 1 | | | | 216 | | | | 217 | |
| Total operating expenses | | | 48,893 | | | | 2,364 | | | | 65 | | | | 51,322 | | | | 5,756 | | | | 57,078 | |
| Operating income (loss) | | | 19,054 | | | | (168 | ) | | | (721 | ) | | | 18,165 | | | | (5,756 | ) | | | 12,409 | |
| Interest expense | | | (45 | ) | | | - | | | | - | | | | (45 | ) | | | (1,266 | ) | | | (1,311 | ) |
| Income (loss) from equity method affiliates | | | (877 | ) | | | - | | | | (2,161 | ) | | | (3,038 | ) | | | - | | | | (3,038 | ) |
| Income (loss) before income taxes | | | 18,132 | | | | (168 | ) | | | (2,882 | ) | | | 15,082 | | | | (7,022 | ) | | | 8,060 | |
| Income tax expense (benefit) | | | - | | | | 192 | | | | - | | | | 192 | | | | (51 | ) | | | 141 | |
| Net income (loss) | | | 18,132 | | | | (360 | ) | | | (2,882 | ) | | | 14,890 | | | | (6,971 | ) | | | 7,919 | |
| Less: Net (loss) attributable to the non-convertible non-controlling interest of the Operating LLC | | | - | | | | - | | | | (2,058 | ) | | | (2,058 | ) | | | - | | | | (2,058 | ) |
| Enterprise net income (loss) | | | 18,132 | | | | (360 | ) | | | (824 | ) | | | 16,948 | | | | (6,971 | ) | | | 9,977 | |
| Less: Net income attributable to the convertible non-controlling interest of Cohen & Company Inc. | | | - | | | | - | | | | - | | | | - | | | | 6,403 | | | | 6,403 | |
| Net income (loss) attributable to Cohen & Company Inc. | | $ | 18,132 | | | $ | (360 | ) | | $ | (824 | ) | | $ | 16,948 | | | $ | (13,374 | ) | | $ | 3,574 | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| Other statement of operations data | | | | | | | | | | | | | | | | | | | | | | | | |
| Compensation and benefits as a percentage of revenue | | | 62.72 | % | | | 71.58 | % | | | (4.57 | )% | | | 63.63 | % | | | N/A | | | | 69.34 | % |
| Operating income / (loss) as a percentage of revenue | | | 28.04 | % | | | (7.65 | )% | | | (109.91 | )% | | | 26.14 | % | | | N/A | | | | 17.86 | % |
| Net income / (loss) as a percentage of revenue | | | 26.69 | % | | | (16.39 | )% | | | (439.33 | )% | | | 21.43 | % | | | N/A | | | | 11.40 | % |
| Net income / (loss) attributable to Cohen & Company Inc. as a percentage of revenue | | | 26.69 | % | | | (16.39 | )% | | | (125.61 | )% | | | 24.39 | % | | | N/A | | | | 5.14 | % |
| | | Capital | | | Asset | | | Principal | | | Segment | | | Unallocated | | | | | |
| | | Markets | | | Management | | | Investing | | | Total | | | (1) | | | Total | |
| Investment banking and new issue | | $ | 44,133 | | | $ | - | | | $ | - | | | $ | 44,133 | | | $ | - | | | $ | 44,133 | |
| Net trading | | | 10,757 | | | | - | | | | - | | | | 10,757 | | | | - | | | | 10,757 | |
| Asset management | | | - | | | | 2,168 | | | | - | | | | 2,168 | | | | - | | | | 2,168 | |
| Principal transactions | | | - | | | | - | | | | 2,181 | | | | 2,181 | | | | - | | | | 2,181 | |
| Other income | | | - | | | | 584 | | | | 48 | | | | 632 | | | | - | | | | 632 | |
| Total revenues | | | 54,890 | | | | 2,752 | | | | 2,229 | | | | 59,871 | | | | - | | | | 59,871 | |
| Compensation and benefits | | | 37,385 | | | | 1,410 | | | | 201 | | | | 38,996 | | | | 5,327 | | | | 44,323 | |
| Business development | | | 675 | | | | 57 | | | | - | | | | 732 | | | | 217 | | | | 949 | |
| Occupancy and equipment | | | 692 | | | | 55 | | | | - | | | | 747 | | | | 292 | | | | 1,039 | |
| Subscriptions, clearing, and execution | | | 2,196 | | | | 82 | | | | 3 | | | | 2,281 | | | | 51 | | | | 2,332 | |
| Professional fee and other operating | | | 2,544 | | | | 216 | | | | 79 | | | | 2,839 | | | | 722 | | | | 3,561 | |
| Depreciation and amortization | | | - | | | | 2 | | | | - | | | | 2 | | | | 170 | | | | 172 | |
| Total operating expenses | | | 43,492 | | | | 1,822 | | | | 283 | | | | 45,597 | | | | 6,779 | | | | 52,376 | |
| Operating income / (loss) | | | 11,398 | | | | 930 | | | | 1,946 | | | | 14,274 | | | | (6,779 | ) | | | 7,495 | |
| Interest expense | | | (22 | ) | | | - | | | | - | | | | (22 | ) | | | (1,474 | ) | | | (1,496 | ) |
| Gain on sale of management contracts | | | - | | | | 837 | | | | - | | | | 837 | | | | - | | | | 837 | |
| Income (loss) from equity method affiliates | | | (482 | ) | | | - | | | | (955 | ) | | | (1,437 | ) | | | - | | | | (1,437 | ) |
| Income (loss) before income taxes | | | 10,894 | | | | 1,767 | | | | 991 | | | | 13,652 | | | | (8,253 | ) | | | 5,399 | |
| Income tax expense (benefit) | | | - | | | | - | | | | - | | | | - | | | | 771 | | | | 771 | |
| Net income (loss) | | | 10,894 | | | | 1,767 | | | | 991 | | | | 13,652 | | | | (9,024 | ) | | | 4,628 | |
| Less: Net income (loss) attributable to the non-convertible non-controlling interest of the Operating LLC | | | - | | | | - | | | | (141 | ) | | | (141 | ) | | | - | | | | (141 | ) |
| Enterprise net income (loss) | | | 10,894 | | | | 1,767 | | | | 1,132 | | | | 13,793 | | | | (9,024 | ) | | | 4,769 | |
| Less: Net income attributable to the convertible non-controlling interest of Cohen & Company Inc. | | | - | | | | - | | | | - | | | | - | | | | 3,361 | | | | 3,361 | |
| Net income (loss) attributable to Cohen & Company Inc. | | $ | 10,894 | | | $ | 1,767 | | | $ | 1,132 | | | $ | 13,793 | | | $ | (12,385 | ) | | $ | 1,408 | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| Other statement of operations data | | | | | | | | | | | | | | | | | | | | | | | | |
| Compensation and benefits as a percentage of revenue | | | 68.11 | % | | | 51.24 | % | | | 9.02 | % | | | 65.13 | % | | | N/A | | | | 74.03 | % |
| Operating income as a percentage of revenue | | | 20.77 | % | | | 33.79 | % | | | 87.30 | % | | | 23.84 | % | | | N/A | | | | 12.52 | % |
| Net income as a percentage of revenue | | | 19.85 | % | | | 64.21 | % | | | 44.46 | % | | | 22.80 | % | | | N/A | | | | 7.73 | % |
| Net income attributable to Cohen & Company Inc. as a percentage of revenue | | | 19.85 | % | | | 64.21 | % | | | 50.79 | % | | | 23.04 | % | | | N/A | | | | 2.35 | % |
|