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Note 9 - Fair Value Disclosures - Fair Value Measurements of Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CREO JV [Member]    
Other investments, at fair value [1] $ 5,830  
Unfunded commitments [1] 9,170  
Other investments, at fair value [1] 5,830  
U.S. Insurance JV [Member]    
Other investments, at fair value 3,450 [2] $ 1,564 [1]
Unfunded commitments [1]   1,567
Other investments, at fair value 3,450 [2] 1,564 [1]
SPAC Fund [Member]    
Other investments, at fair value 1,980 [3] 984 [2]
Other investments, at fair value $ 1,980 [3] $ 984 [2]
Redemption notice period (Day) 30 days [3] 30 days [2]
[1] The CREO JV invests in primarily multi-family commercial real estate mortgage-backed loans and below-investment grade rated tranches in CRE CLOs collateralized by mostly transitional commercial real estate mortgage-backed loans. See note 4.
[2] The U.S. Insurance JV invests in USD denominated debt issued by small and medium sized insurance and reinsurance companies.
[3] The SPAC Fund invests in equity interests of SPACs.