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Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Allowance for Uncollectible Loans and Fees Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Balance at beginning of period $ (1,600) $ (95,200) $ (57,200) $ (125,000)  
Provision for loan losses (381) (9,238) (710) (24,469)  
Charge-offs 600 27,400 1,400 82,100  
Recoveries (400) (3,000) (900) (12,600)  
Balance at end of period (1,800) (80,000) (1,800) (80,000)  
Balance at end of period individually evaluated for impairment 0   0   $ (100)
Balance at end of period collectively evaluated for impairment (1,800)   (1,800)   (57,100)
Loans, interest and fees receivable, gross 107,410   107,410   470,293
Loans, interest and fees receivable individually evaluated for impairment 0   0   400
Loans, interest and fees receivable collectively evaluated for impairment 107,400   107,400   469,900
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]          
Balance at beginning of period     55,800    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]          
Balance at beginning of period     (200)    
Credit Card Receivable [Member]          
Balance at beginning of period 0 (68,000) (43,400) (88,200)  
Provision for loan losses 0 (9,500) 0 (24,800)  
Charge-offs 0 20,100 0 60,300  
Recoveries 0 (1,600) 0 (6,300)  
Balance at end of period 0 (59,000) 0 (59,000)  
Balance at end of period individually evaluated for impairment 0   0   0
Balance at end of period collectively evaluated for impairment 0   0   (43,400)
Loans, interest and fees receivable, gross 0   0   259,500
Loans, interest and fees receivable individually evaluated for impairment 0   0   0
Loans, interest and fees receivable collectively evaluated for impairment 0   0   259,500
Credit Card Receivable [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]          
Balance at beginning of period     43,400    
Credit Card Receivable [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]          
Balance at beginning of period     0    
Automobile Loan [Member]          
Balance at beginning of period (1,600) (1,400) (1,400) (1,700)  
Provision for loan losses (400) (100) (700) 0  
Charge-offs 600 300 1,400 1,100  
Recoveries (400) (200) (900) (800)  
Balance at end of period (1,800) (1,400) (1,800) (1,400)  
Balance at end of period individually evaluated for impairment 0   0   (100)
Balance at end of period collectively evaluated for impairment (1,800)   (1,800)   (1,300)
Loans, interest and fees receivable, gross 107,400   107,400   94,600
Loans, interest and fees receivable individually evaluated for impairment 0   0   400
Loans, interest and fees receivable collectively evaluated for impairment 107,400   107,400   94,200
Automobile Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]          
Balance at beginning of period     0    
Automobile Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]          
Balance at beginning of period     (200)    
Other Unsecured Lending Products [Member]          
Balance at beginning of period 0 (25,800) (12,400) (35,100)  
Provision for loan losses 0 400 0 300  
Charge-offs 0 7,000 0 20,700  
Recoveries 0 (1,200) 0 (5,500)  
Balance at end of period 0 $ (19,600) 0 $ (19,600)  
Balance at end of period individually evaluated for impairment 0   0   0
Balance at end of period collectively evaluated for impairment 0   0   (12,400)
Loans, interest and fees receivable, gross 0   0   116,200
Loans, interest and fees receivable individually evaluated for impairment 0   0   0
Loans, interest and fees receivable collectively evaluated for impairment $ 0   0   $ 116,200
Other Unsecured Lending Products [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]          
Balance at beginning of period     12,400    
Other Unsecured Lending Products [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]          
Balance at beginning of period     $ 0