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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
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Balance at beginning of period $ (57,200) $ (125,000)  
Provision for loan losses (147) (4,135)  
Charge-offs 400 26,900  
Recoveries (300) (3,700)  
Balance at end of period (1,600) (105,900)  
Balance at end of period individually evaluated for impairment 0   $ (100)
Balance at end of period collectively evaluated for impairment (1,600)   (57,100)
Loans, interest and fees receivable, gross 99,916   470,293
Loans, interest and fees receivable individually evaluated for impairment 0   400
Loans, interest and fees receivable collectively evaluated for impairment 99,900   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 (43,400) (88,200)  
Provision for loan losses 0 (4,200)  
Charge-offs 0 19,000  
Recoveries 0 (1,700)  
Balance at end of period 0 (75,100)  
Balance at end of period individually evaluated for impairment 0   0
Balance at end of period collectively evaluated for impairment 0   (43,400)
Loans, interest and fees receivable, gross 0   259,500
Loans, interest and fees receivable individually evaluated for impairment 0   0
Loans, interest and fees receivable collectively evaluated for impairment 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 (1,400) (1,700)  
Provision for loan losses (100) (100)  
Charge-offs 400 600  
Recoveries (300) (300)  
Balance at end of period (1,600) (1,500)  
Balance at end of period individually evaluated for impairment 0   (100)
Balance at end of period collectively evaluated for impairment (1,600)   (1,300)
Loans, interest and fees receivable, gross 99,900   94,600
Loans, interest and fees receivable individually evaluated for impairment 0   400
Loans, interest and fees receivable collectively evaluated for impairment 99,900   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 (12,400) (35,100)  
Provision for loan losses 0 200  
Charge-offs 0 7,300  
Recoveries 0 (1,700)  
Balance at end of period 0 $ (29,300)  
Balance at end of period individually evaluated for impairment 0   0
Balance at end of period collectively evaluated for impairment 0   (12,400)
Loans, interest and fees receivable, gross 0   116,200
Loans, interest and fees receivable individually evaluated for impairment 0   0
Loans, interest and fees receivable collectively evaluated for impairment 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