Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Aging of Delinquent Loans and Fees Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Balance of loans greater than 90-days delinquent still accruing interest and fees	$ 2.8	$ 2.6
Loans at Amortized Cost [Member]
Financing receivable, gross	118.0	118.0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing receivable, gross	9.2	9.4
Financial Asset, 60 to 89 Days Past Due [Member]
Financing receivable, gross	3.8	3.4
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, gross	4.9	3.5
Financial Asset, Past Due [Member]
Financing receivable, gross	17.9	16.3
Financial Asset, Not Past Due [Member]
Financing receivable, gross	$ 100.1	$ 101.7