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Note 4 - Insurance SPAC Investments and Other Recent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 11 Months Ended 12 Months Ended
Sep. 03, 2021
Apr. 16, 2021
Dec. 22, 2020
Dec. 21, 2020
Oct. 15, 2020
Nov. 24, 2020
Dec. 31, 2021
Dec. 31, 2020
Feb. 28, 2022
Dec. 31, 2019
Dec. 31, 2018
Sep. 01, 2017
Aug. 31, 2017
Common Stock, Par or Stated Value Per Share (in dollars per share)             $ 0.01 $ 0.01       $ 0.01 $ 0.001
Other Investments, Fair Value Disclosure             $ 56,033 $ 58,540          
Common Stock, Shares, Issued, Total (in shares)             1,697,443 1,325,529          
Due from Related Parties, Total             $ 4,581 $ 2,812          
Equity Method Investments             48,238 13,482   $ 3,799 $ 0    
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance             88,091 57,528   $ 15,437 $ 6,664    
Securities Sold under Agreements to Repurchase, Total             3,171,415 5,713,212          
Securities Purchased under Agreements to Resell, Total             3,175,645 5,716,343          
GCF Reverse Purchase and Repurchase Agreements [Member]                          
Securities Sold under Agreements to Repurchase, Total             0            
Securities Purchased under Agreements to Resell, Total             0            
CREO JV [Member]                          
Required Investment, Percentage Of Total Equity 7.50%                        
Required Investment in Equity, Limitation $ 15,000                        
Insurance SPAC III Sponsor Entities [Member]                          
Equity Method Investments             4,543            
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance             4,808            
Net Carrying Value of Investment             (265)            
Insurance SPAC III [Member]                          
Due from Related Parties, Total             500 0          
SFT Class A Common Stock [Member]                          
Investment Owned, Balance, Shares (in shares)         350,000                
CREO JV [Member]                          
Other Investments, Fair Value Disclosure             5,830 $ 0          
Investments Committed Amount 15,000                        
Investments Committed, Amount By Investor $ 435,000                        
Sponsor Entities [Member] | Private Placement [Member] | Insurance SPAC [Member]                          
Number of Placement Units Purchased (in shares)         375,000                
Sponsor Entities [Member] | SFT Class A Common Stock [Member]                          
Investment Owned, Balance, Shares (in shares)         375,000                
Common Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.0001                
Sponsor Entities [Member] | SFT Warrants [Member]                          
Investment Owned, Balance, Shares (in shares)         187,500                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 11.50                
Sponsor Entities [Member] | Sponsor Shares [Member]                          
Investment Owned, Balance, Shares (in shares)         4,497,525                
Operating LLC [Member] | INSU Pipe LLC [Member]                          
Distribution Made to Parent's Wholly Owned Subsidiary, Securities to be Distributed (in shares)               350,000          
Ownership Percentage               100.00%          
Operating LLC [Member] | Private Placement [Member] | Insurance SPAC [Member]                          
Number of Placement Units Purchased (in shares)         122,665                
Operating LLC [Member] | Sponsor Shares [Member]                          
Investment Owned, Balance, Shares (in shares)         2,019,721                
Operating LLC [Member] | SFT [Member]                          
Other Investments, Fair Value Disclosure             $ 5,785            
Investment Owned, Closing Share Price (in dollars per share)             $ 3.41            
Operating LLC [Member] | MetroMile [Member]                          
Other Investments, Fair Value Disclosure             $ 5,500            
Investment Owned, Closing Share Price (in dollars per share)             $ 2.19            
Company's Subsidiary [Member] | SFT Class A Common Stock [Member]                          
Investment Owned, Balance, Shares (in shares)               600,000          
Investment Owned, Price Per Share (in dollars per share)               $ 10.00          
Distribution Made to Parent's Wholly Owned Subsidiary, Securities to be Distributed (in shares)               250,000          
SPAC II [Member] | Private Placement [Member]                          
Units Issued During Period, Units, New Issues (in shares)   452,500                      
SPAC II [Member] | Founder Shares [Member]                          
Units Issued During Period, Units, New Issues (in shares)   6,669,667                      
SPAC II [Member] | Founder Shares [Member] | Common Class A [Member] | Noncontrolling Interest [Member]                          
Units Issued During Period, Units, New Issues (in shares)   3,414,875                      
SPAC II [Member] | Founder Shares [Member] | Operating LLC [Member] | Common Class A [Member]                          
Units Issued During Period, Units, New Issues (in shares)   3,254,792                      
SPAC II [Member] | IPO [Member]                          
Common Stock, Par or Stated Value Per Share (in dollars per share)           $ 11.50              
Units Issued During Period, Shares Per Unit (in shares)           1              
Units Issued During Period, Warrants Per Unit (in shares)           0.33              
SPAC II [Member] | Founder Shares [Member]                          
Number of Common Stock, Vested (in shares)           1,569,333              
SPAC II [Member] | Founder Shares [Member] | Share-based Payment Arrangement, Tranche One [Member]                          
Number of Common Stock, Available to Vest (in shares)           2,550,167              
SPAC II [Member] | Founder Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member]                          
Number of Common Stock, Available to Vest (in shares)           2,550,167              
MetroMile [Member] | Share-based Payment Arrangement, Tranche One [Member] | Minimum [Member]                          
Trigger Share Price For Share Vesting (in dollars per share)           $ 15.00              
MetroMile [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Minimum [Member]                          
Trigger Share Price For Share Vesting (in dollars per share)           $ 17.00              
Insurance SPAC III Sponsor Entities [Member]                          
Sale of Stock, Number of Shares Issued in Transaction (in shares)     25,000,000                    
Option Period On Additional Units To Be Purchased (Day)     45 days                    
Sale of Stock, Number of Shares Issuable, Option (in shares)     3,270,000                    
Common Stock, Shares, Issued, Total (in shares)     34,100,000                    
Payments of Stock Issuance Costs             $ 71            
Commitments, Operating and Acquisition Expenses             $ 810            
Insurance SPAC III Sponsor Entities [Member] | Subsequent Event [Member]                          
Commitments, Operating and Acquisition Expenses                 $ 310        
Insurance SPAC III Sponsor Entities [Member] | Insurance SPAC Warrant III [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 11.50                    
Units Issued During Period, Warrants Per Unit (in shares)     0.33                    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)     1                    
Shares Issued, Price Per Share (in dollars per share)     $ 10.00                    
Insurance SPAC III Sponsor Entities [Member] | Common Class A [Member]                          
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.0001                    
Units Issued During Period, Shares Per Unit (in shares)     1                    
Insurance SPAC III Sponsor Entities [Member] | Private Placement [Member]                          
Sale of Stock, Number of Shares Issued in Transaction (in shares)     575,000                    
Insurance SPAC III Sponsor Entities [Member] | IPO [Member]                          
Shares Issued, Price Per Share (in dollars per share)     $ 10.00                    
Sale of Stock, Consideration Received on Transaction     $ 5,750                    
Proceeds From Issuance of Units, Trust Account     250,000                    
Payments of Equity Issuance Costs, Trust Account     $ 10,600                    
Percentage of Public Shares Redeemed     100.00%                    
Insurance SPAC III Sponsor Entities [Member] | Over-Allotment Option [Member]                          
Sale of Stock, Number of Shares Issued in Transaction (in shares)     3,200,000 3,200,000                  
Insurance SPAC III Sponsor Entities [Member] | Founder Shares [Member]                          
Investment Owned, Balance, Shares (in shares)     8,525,000                    
Founder Shares, Percent of Shares to Become Transferable or Salable Upon Consummation of Business Combination     25.00%                    
Closing Share Price for Founder Shares to Become Transferable or Salable, Tranche One (in dollars per share)     $ 12.00                    
Closing Share Price for Founder Shares to Become Transferable or Salable, Tranche Two (in dollars per share)     13.50                    
Closing Share Price for Founder Shares to Become Transferable or Salable, Tranche Three (in dollars per share)     $ 17.00                    
Equity Method Investment, Shares Purchased (in shares)     4,267,500                    
Insurance SPAC [Member] | Insurance SPAC Warrant III [Member]                          
Proceeds From Issuance of Units     $ 250,000