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Note 11 - Collateralized Securities Transactions (Details Textual) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 19, 2018 | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 25, 2018 USD ($)
Securities Purchased under Agreements to Resell, Total |  | $ 5,716,343 |  |  |  | $ 7,500,002 |  |  |  | $ 5,716,343 | $ 7,500,002 |  |
Fair Value of Securities Received as Collateral that Can be Resold or Repledged |  | $ 5,885,656 |  |  |  | $ 7,769,693 |  |  |  | $ 5,885,656 | $ 7,769,693 |  |
Number of Counterparties Related to Reverse Repurchase Agreements |  | 38 |  |  |  | 41 |  |  |  | 38 | 41 |  |
Securities Sold under Agreements to Repurchase, Total |  | $ 5,713,212 |  |  |  | $ 7,534,443 |  |  |  | $ 5,713,212 | $ 7,534,443 |  |
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged |  | 5,768,018 |  |  |  | 7,561,978 |  |  |  | 5,768,018 | 7,561,978 |  |
Revenues, Total |  | 66,365 | $ 21,856 | $ 24,119 | $ 17,770 | 16,090 | $ 11,267 | $ 11,169 | $ 11,140 | 130,110 | 49,666 | $ 49,386 |
Fixed Income Clearing Corporation the (FICC) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Purchased under Agreements to Resell, Total |  | 99,750 |  |  |  | 371,025 |  |  |  | 99,750 | 371,025 |  |
Securities Sold under Agreements to Repurchase, Total |  | $ 2,155,850 |  |  |  | $ 5,138,712 |  |  |  | $ 2,155,850 | $ 5,138,712 |  |
Gestational Repo Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Counterparties Related to Reverse Repurchase Agreements |  | 11 |  |  |  | 7 |  |  |  | 11 | 7 |  |
Revenues, Total |  |  |  |  |  |  |  |  |  | $ 33,980 | $ 12,011 | $ 4,624 |
Intraday and Overnight Lending Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Commitment Amount |  | $ 75,000 |  |  |  |  |  |  |  | 75,000 |  |  |
Debt Instrument, Renewal Term (Day) | 364 days |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.12% |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt, Total |  | 32,818 |  |  |  |  |  |  |  | 32,818 |  |  |
Interest Payable, Current |  | 2 |  |  |  |  |  |  |  | 2 |  |  |
Intraday and Overnight Lending Facility [Member] | Payable to Brokers, Dealers, and Clearing Agencies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Short Term Debt, Including Accrued Interest |  | $ 32,820 |  |  |  |  |  |  |  | $ 32,820 |  |  |
Intraday and Overnight Lending Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Intraday and Overnight Lending Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Fifth Third Financial Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000

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