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Note 21 - Equity - Rollforward of Units Outstanding (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Issuance of Units (in shares) | 402,350 | 410,820 | 247,120 |
Repurchase and retirement of common stock (in shares) | (1,211,810) | (318,900) | (750,810) |
Issuance of Units for purchase of IMXI (in shares) |  | 22,429,541 |  |
Additional units purchased by Daniel G. Cohen (in shares) | 275,000 |  |  |
Balance, shares (in shares) | 38,418,255 | 38,952,715 | 16,431,254 |
Issuance of Units as equity compensation (in shares) |  |  |  |
Balance, shares (in shares) | 38,418,255 | 38,952,715 | 16,431,254 | 16,934,944
Cohen & Company [Member] |  |  |  |
Issuance of Units (in shares) | 402,350 | 410,820 | 247,120 |
Repurchase and retirement of common stock (in shares) | (1,211,810) | (318,900) | (750,810) |
Issuance of Units for purchase of IMXI (in shares) |  |  |  |
Additional units purchased by Daniel G. Cohen (in shares) |  |  |  |
Balance, shares (in shares) | 10,389,624 | 11,199,084 | 11,107,164 |
Issuance of Units as equity compensation (in shares) |  |  |  |
Balance, shares (in shares) | 10,389,624 | 11,199,084 | 11,107,164 | 11,610,854
Daniel G. Cohen [Member] |  |  |  |
Issuance of Units (in shares) |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  |  |
Issuance of Units for purchase of IMXI (in shares) |  | 12,549,273 |  |
Additional units purchased by Daniel G. Cohen (in shares) | 275,000 | 268,445 |  |
Balance, shares (in shares) | 18,076,275 | 17,801,275 | 4,983,557 |
Issuance of Units as equity compensation (in shares) |  |  |  |
Balance, shares (in shares) | 18,076,275 | 17,801,275 | 4,983,557 | 4,983,557
DGC Trust [Member] |  |  |  |
Issuance of Units (in shares) |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  |  |
Issuance of Units for purchase of IMXI (in shares) |  | 9,880,268 |  |
Additional units purchased by Daniel G. Cohen (in shares) |  |  |  |
Balance, shares (in shares) | 9,880,268 | 9,880,268 |  |
Issuance of Units as equity compensation (in shares) |  |  |  |
Balance, shares (in shares) | 9,880,268 | 9,880,268 |  |
Others [Member] |  |  |  |
Issuance of Units (in shares) |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  |  |
Issuance of Units for purchase of IMXI (in shares) |  |  |  |
Additional units purchased by Daniel G. Cohen (in shares) |  | (268,445) |  |
Balance, shares (in shares) | 72,088 | 72,088 | 340,533 |
Issuance of Units as equity compensation (in shares) |  |  |  |
Balance, shares (in shares) | 72,088 | 72,088 | 340,533 | 340,533

X
- Definition Represents additional units purchased. + References No definition available. + Details
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- Definition Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Number of units issued for unit-based payment arrangement issued by partnership. Partner includes, but is not limited to, general, limited and preferred partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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