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Note 28 - Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Lessee, Future Lease Commitments [Table Text Block] |
|  | Lease |  |  | Less: Sublease |  |  | Net Commitment |
2021 |  | $ | 1,496 |  |  | $ | (98 | ) |  | $ | 1,398 |
2022 |  |  | 1,188 |  |  |  | - |  |  |  | 1,188 |
2023 |  |  | 1,091 |  |  |  | - |  |  |  | 1,091 |
2024 |  |  | 1,055 |  |  |  | - |  |  |  | 1,055 |
2025 |  |  | 982 |  |  |  | - |  |  |  | 982 |
2026 and Thereafter |  |  | 3,112 |  |  |  | - |  |  |  | 3,112 |
|  | $ | 8,924 |  |  | $ | (98 | ) |  | $ | 8,826 |

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- Definition Tabular disclosure of future lease commitments for lessee. + References No definition available. + Details
Name: | cohn_LesseeFutureLeaseCommitmentsTableTextBlock
Namespace Prefix: | cohn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration