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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, 2024
Mar. 31, 2023
Dec. 31, 2023
Balance at beginning of period $ (1,800) $ (1,600)  
Provision for credit losses (2,944) (704)  
Charge-offs 1,800 1,000  
Recoveries (500) (400)  
Balance at end of period (3,400) $ (1,700)  
Balance at end of period individually evaluated for impairment (1,600)   $ 0
Balance at end of period collectively evaluated for impairment (1,800)   (1,800)
Loans at amortized cost 100,144   98,425
Loans at amortized cost individually evaluated for impairment 2,400   0
Loans at amortized cost collectively evaluated for impairment 119,900   118,000
Loans at Amortized Cost [Member]      
Loans at amortized cost $ 122,300   $ 118,000