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Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Cash, Uninsured Amount $ 3,300   $ 3,300            
Retained Earnings (Accumulated Deficit) 280,956   280,956     $ 204,415      
Payment for Acquisition, Loan and Lease, Held-for-Investment 59,000 $ 56,300 179,300 $ 165,600          
Financing Receivable, Deferred Commitment Fee $ 18,288   $ 18,288     16,190      
Weighted Average Remaining Accretion Period of Deferred Revenue (Month)     27 months            
Financing Receivable, Modified, Number of Contracts         133,134        
Financing Receivable, Modified, Accumulated   $ 138,400   $ 138,400 $ 138,400        
Effective Income Tax Rate Reconciliation, Percent 21.20% 17.60% 22.50% 7.10%          
Unrecognized Tax Benefits, Interest on Income Taxes Expense $ 300   $ 1,400            
Loans Receivable, Fair Value Disclosure 2,049,993   2,049,993     1,817,976      
Financing Receivable, before Allowance for Credit Loss 118,007   118,007     105,267      
Financing Receivable, Allowance for Credit Loss 1,831 $ 1,800 1,831 $ 1,800 $ 1,800 1,643 $ 1,600   $ 57,200
Accounts Payable and Accrued Liabilities, Total $ 48,170   $ 48,170     $ 44,332      
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]                  
Retained Earnings (Accumulated Deficit)               $ 8,600  
Financing Receivable, Deferred Commitment Fee               (15,600)  
Loans Receivable, Fair Value Disclosure               315,000  
Financing Receivable, before Allowance for Credit Loss               (375,700)  
Financing Receivable, Allowance for Credit Loss               (55,600)  
Accounts Payable and Accrued Liabilities, Total               (600)  
Deferred Income Tax Liabilities, Net               $ 2,500