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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Balance at beginning of period   $ (1,600) $ (1,643) $ (57,200)  
Provision for credit losses $ (309) (182) (1,013) (329)  
Charge-offs   400   800  
Recoveries   (200)   (500)  
Balance at end of period (1,700) (1,600) (1,700) (1,600)  
Loans, interest and fees receivable, gross 115,055   115,055   $ 105,267
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)  
Automobile Loan [Member]          
Balance at beginning of period (1,700) (1,600) (1,600) (1,400)  
Provision for credit losses (300) (200) (1,000) (300)  
Charge-offs 800 400 1,800 800  
Recoveries (500) (200) (900) (500)  
Balance at end of period (1,700) (1,600) (1,700) (1,600)  
Balance at end of period individually evaluated for impairment 0   0   0
Balance at end of period collectively evaluated for impairment (1,700)   (1,700)   (1,600)
Loans, interest and fees receivable, gross 115,100   115,100   105,300
Loans, interest and fees receivable individually evaluated for impairment 0   0   0
Loans, interest and fees receivable collectively evaluated for impairment $ 115,100   $ 115,100   $ 105,300
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)  
Credit Card Receivable [Member]          
Balance at beginning of period   0   (43,400)  
Provision for credit losses   0   0  
Charge-offs   0   0  
Recoveries   0   0  
Balance at end of period   0   0  
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  
Other Unsecured Lending Products [Member]          
Balance at beginning of period   0   (12,400)  
Provision for credit losses   0   0  
Charge-offs   0   0  
Recoveries   0   0  
Balance at end of period   $ 0   0  
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