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Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jan. 01, 2022
USD ($)
Retained Earnings (Accumulated Deficit), Total $ 180,424   $ 180,424   $ 180,424 $ 60,236    
Payments to Acquire Loans and Leases Held-for-investment, Total 56,300 $ 47,800 165,600 $ 146,100        
Loans and Leases Receivable, Deferred Income 16,560   $ 16,560   16,560 $ 29,281    
Weighted Average Remaining Accretion Period of Deferred Revenue (Month)     27 months     15 months    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 16,600   $ 16,600   $ 16,600 $ 20,400    
Financing Receivable, Allowance for Credit Loss, Recovery $ 400 $ 3,000 $ 900 $ 12,600        
Financing Receivable, Modifications, Number of Contracts         133,134   57,142  
Financing Receivable, Troubled Debt Restructuring, Postmodification         $ 138,400   $ 62,200  
Effective Income Tax Rate Reconciliation, Percent, Total 17.60% 18.70% 7.10% 18.30%        
Gain (Loss) on Extinguishment of Debt, Total $ (0) $ (16,184) $ (0) $ (29,439)        
Loans Receivable, Fair Value Disclosure 1,728,091   1,728,091   1,728,091 1,026,424    
Loans and Leases Receivable, Gross 107,410   107,410   107,410 470,293    
Loans and Leases Receivable, Allowance 1,766   1,766   1,766 57,201    
Accounts Payable and Accrued Liabilities, Total 43,490   43,490   $ 43,490 $ 42,287    
Five Point Eight Seven Five Percent Convertible Senior Notes Due Two Thousand Thirty Five [Member] | Convertible Debt [Member]                
Debt Instrument, Interest Rate, Stated Percentage   5.875%   5.875%     5.875%  
Extinguishment of Debt, Amount   $ 12,700   $ 33,800        
Repayments of Convertible Debt   25,400   54,300        
Gain (Loss) on Extinguishment of Debt, Total   (16,200)   (29,400)        
Receivables Recoveries from Employed Third-Party Collectors ][Member]                
Financing Receivable, Allowance for Credit Loss, Recovery 400 1,800 900 6,900        
Receivable Recoveries from Sales of Charged-Off Accounts to Third-Parties [Member]                
Financing Receivable, Allowance for Credit Loss, Recovery $ 0 $ 1,100 $ 0 $ 5,700        
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]                
Retained Earnings (Accumulated Deficit), Total               $ 8,600
Loans and Leases Receivable, Deferred Income               (15,600)
Loans Receivable, Fair Value Disclosure               315,000
Loans and Leases Receivable, Gross               (375,700)
Loans and Leases Receivable, Allowance               (55,600)
Accounts Payable and Accrued Liabilities, Total               (600)
Deferred Income Tax Liabilities, Net               $ 2,500