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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Balance at beginning of period $ (3,400) $ (1,700) $ (1,800) $ (1,600)  
Provision for credit losses (1,746) (309) (4,690) (1,013)  
Charge-offs 3,400 800 5,300 1,800  
Recoveries (700) (500) (1,200) (900)  
Balance at end of period (2,400) $ (1,700) (2,400) $ (1,700)  
Balance at end of period individually evaluated for impairment (600)   (600)   $ 0
Balance at end of period collectively evaluated for impairment (1,800)   (1,800)   (1,800)
Loans at amortized cost individually evaluated for impairment 600   600   0
Loans at amortized cost collectively evaluated for impairment 117,400   117,400   118,000
Loans at Amortized Cost [Member]          
Loans at amortized cost $ 118,000   $ 118,000   $ 118,000