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Note 11 - Collateralized Securities Transactions (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 25, 2018
USD ($)
Securities Purchased under Agreements to Resell, Total $ 3,175,645 $ 5,716,343    
Fair Value of Securities Received as Collateral that Can be Resold or Repledged $ 3,249,411 $ 5,885,656    
Number of Counterparties Related to Reverse Repurchase Agreements 14 38    
Securities Sold under Agreements to Repurchase, Total $ 3,171,415 $ 5,713,212    
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged 3,232,091 5,768,018    
Revenues, Total 146,368 130,110 $ 49,666  
Fixed Income Clearing Corporation the (FICC) [Member]        
Securities Purchased under Agreements to Resell, Total   99,750    
Securities Sold under Agreements to Repurchase, Total   $ 2,155,850    
GCF Reverse Purchase and Repurchase Agreements [Member]        
Securities Purchased under Agreements to Resell, Total 0      
Securities Sold under Agreements to Repurchase, Total $ 0      
Gestational Repo Business [Member]        
Number of Counterparties Related to Reverse Repurchase Agreements 14 11    
Revenues, Total $ 46,139 $ 33,980 $ 12,011  
Fifth Third Financial Bank [Member]        
Line of Credit Facility, Current Borrowing Capacity       $ 25,000