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Note 9 - Fair Value Disclosures (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
     
 
     
 
   
Significant
   
Significant
 
     
 
   
Quoted Prices in
   
Other Observable
   
Unobservable
 
     
 
   
Active Markets
   
Inputs
   
Inputs
 
Assets
 
Fair Value
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
Investments-trading:
                               
U.S. government agency MBS and CMOs
  $
162,031
    $
-
    $
162,031
    $
-
 
U.S. government agency debt securities
   
6,904
     
-
     
6,904
     
-
 
RMBS
   
14
     
-
     
14
     
-
 
U.S. Treasury securities
   
607
     
607
     
-
     
-
 
ABS
   
1
     
-
     
1
     
-
 
SBA loans
   
2,742
     
-
     
2,742
     
-
 
Corporate bonds and redeemable preferred stock
   
36,388
     
-
     
36,388
     
-
 
Foreign government bonds
   
659
     
-
     
659
     
-
 
Municipal bonds
   
19,400
     
-
     
19,400
     
-
 
Certificates of deposit
   
70
     
-
     
70
     
-
 
Derivatives
   
13,717
     
-
     
13,717
     
-
 
Equity securities
   
428
     
-
     
428
     
-
 
Total investments - trading
  $
242,961
    $
607
    $
242,354
    $
-
 
                                 
Other investments, at fair value:
                               
Equity securities
  $
51,593
    $
17,422
    $
34,171
    $
-
 
Corporate bonds and redeemable preferred stock    
476
     
-
     
476
     
-
 
Subordinated Notes    
1,519
     
-
     
1,519
     
-
 
RTLs
   
2,300
     
-
     
2,300
     
-
 
Residential loans
   
104
     
-
     
104
     
-
 
     
55,992
    $
17,422
    $
38,570
    $
-
 
Investments measured at NAV (1)
   
2,548
     
 
     
 
     
 
 
Total other investments, at fair value
  $
58,540
     
 
     
 
     
 
 
                                 
Liabilities
                               
Trading securities sold, not yet purchased:
                               
U.S. Treasury securities
  $
3,348
    $
3,348
    $
-
    $
-
 
Corporate bonds and redeemable preferred stock
   
29,206
     
-
     
29,206
     
-
 
Municipal bonds
   
20
     
-
     
20
     
-
 
Derivatives
   
11,822
     
-
     
11,822
     
-
 
Equity securities    
43
     
43
     
-
     
-
 
Total trading securities sold, not yet purchased
  $
44,439
    $
3,391
    $
41,048
    $
-
 
                                
Other investments, sold not yet purchased:                                
Derivatives   $
233
    $
233
    $
-
    $
-
 
Equity securities    
7,182
     
7,182
     
-
     
-
 
    $
7,415
    $
7,415
    $
-
    $
-
 
     
 
     
 
   
Significant
   
Significant
 
     
 
   
Quoted Prices in
   
Other Observable
   
Unobservable
 
     
 
   
Active Markets
   
Inputs
   
Inputs
 
Assets
 
Fair Value
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
Investments-trading:
                               
U.S. government agency MBS and CMOs
  $
196,146
    $
-
    $
196,146
    $
-
 
U.S. government agency debt securities
   
14,680
     
-
     
14,680
     
-
 
RMBS
   
15
     
-
     
15
     
-
 
U.S. Treasury securities
   
11,105
     
11,105
     
-
     
-
 
ABS
   
100
     
-
     
100
     
-
 
SBA loans
   
27,634
     
-
     
27,634
     
-
 
Corporate bonds and redeemable preferred stock
   
38,503
     
-
     
38,503
     
-
 
Foreign government bonds
   
844
     
-
     
844
     
-
 
Municipal bonds
   
13,737
     
-
     
13,737
     
-
 
Certificates of deposit
   
841
     
-
     
841
     
-
 
Derivatives
   
3,686
     
-
     
3,686
     
-
 
Equity securities
   
561
     
-
     
561
     
-
 
Total investments - trading
  $
307,852
    $
11,105
    $
296,747
    $
-
 
                                 
Other investments, at fair value:
                               
Equity Securities
  $
8,875
    $
2,009
    $
6,866
    $
-
 
Corporate bonds and redeemable preferred stock    
477
     
-
     
477
     
-
 
CLOs
   
2,522
     
-
     
-
     
2,522
 
Residential loans
   
99
     
-
     
99
     
-
 
     
11,973
    $
2,009
    $
7,442
    $
2,522
 
Investments measured at NAV (1)
   
2,891
     
 
     
 
     
 
 
Total other investments, at fair value
  $
14,864
     
 
     
 
     
 
 
                                 
Liabilities
                               
Trading securities sold, not yet purchased:
                               
U.S. Treasury securities
  $
16,827
    $
16,827
    $
-
    $
-
 
Corporate bonds and redeemable preferred stock
   
58,083
     
-
     
58,083
     
-
 
Municipal bonds
   
20
     
-
     
20
     
-
 
Derivatives
   
3,017
     
-
     
3,017
     
-
 
Total trading securities sold, not yet purchased
  $
77,947
    $
16,827
    $
61,120
    $
-
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Year Ended December 31,
 
   
2020
   
2019
 
Beginning of Period
  $
2,522
    $
2,756
 
Net trading
   
(57
)    
-
 
Gains & losses (1)
   
(604
)    
(123
)
Accretion of income (1)
   
124
     
414
 
Purchases
   
638
     
-
 
Sales and returns of capital
   
(5,601
)    
(525
)
Reclassification of RTLs    
5,278
     
-
 
Transfer out of Level 3 (2)    
(2,300
)    
-
 
End of Period
  $
-
    $
2,522
 
                 
Change in unrealized gains / (losses) (3)
  $
-
    $
(4
)
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
     
 
 
 
 
Significant
   
 
   
Range of
 
   
Fair Value
 
Valuation
 
Unobservable
 
Weighted
   
Significant
 
   
December 31, 2019
 
Technique
 
Inputs
 
Average
   
Inputs
 
Assets
                             
Other investments, at fair value
                             
CLOs
  $
2,522
 
Discounted Cash Flow Model
 
Yield
   
17.9
%    
16.9%
-
19.2%
 
     
 
 
 
 
Duration (years)
   
5.8
     
5.3
-
6.5
 
     
 
 
 
 
Default rate
   
2.0
%    
2.0%
-
2.0%
 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
   
December 31, 2020
   
Unfunded Commitments
   
Redemption Frequency
   
Redemption Notice Period
 
Other investments, at fair value
                               
U.S. Insurance JV (a)   $
1,564
    $
1,567
     
N/A
     
N/A
 
SPAC Funds (b)
   
984
     
N/A
     
Quarterly after 1 year lock up
     
90 days
 
    $
2,548
     
 
     
 
     
 
 
   
December 31, 2019
   
Unfunded Commitments
   
Redemption Frequency
   
Redemption Notice Period
 
Other investments, at fair value
                               
U.S. Insurance JV (a)
  $
2,223
    $
817
     
N/A
     
N/A
 
SPAC Funds (b)    
668
     
NA
     
Quarterly after 1 year lock up
     
90 days
 
    $
2,891