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Note 1 - Organization and Nature of Operations (Details Textual) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 01, 2017 $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 $ / shares | Aug. 31, 2017 $ / shares
Stockholders' Equity Note, Stock Split, Conversion Ratio | 10 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.001
Assets under Management, Carrying Amount |  | $ 2,770 |  |
Number of Operating Segments |  | 3 |  |
Collateralized Debt Obligations [Member] |  |  |  |
Assets under Management, Carrying Amount |  | $ 2,060 |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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