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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Balance at beginning of period $ (2,400) $ (1,700) $ (1,800) $ (1,600)  
Provision for credit losses (4,633) (538) (9,323) (1,551)  
Charge-offs 3,100 900 8,400 2,800  
Recoveries (700) (500) (1,900) (1,400)  
Balance at end of period (4,600) $ (1,800) (4,600) $ (1,800)  
Balance at end of period individually evaluated for impairment (600)   (600)   $ 0
Balance at end of period collectively evaluated for impairment (4,000)   (4,000)   (1,800)
Loans at amortized cost individually evaluated for impairment 3,400   3,400   0
Loans at amortized cost collectively evaluated for impairment 107,200   107,200   118,000
Loans at Amortized Cost [Member]          
Loans at amortized cost $ 110,600   $ 110,600   $ 118,000