Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Aging of Delinquent Loans and Fees Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing receivable, gross	$ 118,007	$ 105,267
Automobile Loan [Member]
Financing receivable, gross	118,000	105,300
Balance of loans greater than 90-days delinquent still accruing interest and fees	2,000	1,700
Automobile Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing receivable, gross	8,600	8,500
Automobile Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing receivable, gross	3,300	3,000
Automobile Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, gross	2,600	2,100
Automobile Loan [Member] | Financial Asset, Past Due [Member]
Financing receivable, gross	14,500	13,600
Automobile Loan [Member] | Financial Asset, Not Past Due [Member]
Financing receivable, gross	$ 103,500	$ 91,700