Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Components of Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from contracts with customers		$ 12,410	$ 7,312	$ 22,676	$ 11,891
Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	7,381	4,269	13,079	6,891
Servicing Income [Member]
Revenue from contracts with customers		1,029	648	2,111	1,361
Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		4,000	2,395	7,486	3,639
Credit and Other Investments [Member]
Revenue from contracts with customers		12,169	6,998	22,167	11,237
Credit and Other Investments [Member] | Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	7,381	4,269	13,079	6,891
Credit and Other Investments [Member] | Servicing Income [Member]
Revenue from contracts with customers		804	349	1,634	737
Credit and Other Investments [Member] | Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		3,984	2,380	7,454	3,609
Auto Finance [Member]
Revenue from contracts with customers		241	314	509	654
Auto Finance [Member] | Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	0	0	0	0
Auto Finance [Member] | Servicing Income [Member]
Revenue from contracts with customers		225	299	477	624
Auto Finance [Member] | Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		$ 16	$ 15	$ 32	$ 30

[1] Interchange revenue is presented net of customer reward expense.