Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Components of Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Revenue from contracts with customers		$ 13,754	$ 5,556
Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	8,495	2,881
Servicing Income [Member]
Revenue from contracts with customers		1,786	1,969
Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		3,473	706
Credit and Other Investments [Member]
Revenue from contracts with customers		12,759	4,465
Credit and Other Investments [Member] | Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	8,495	2,881
Credit and Other Investments [Member] | Servicing Income [Member]
Revenue from contracts with customers		857	947
Credit and Other Investments [Member] | Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		3,407	637
Auto Finance [Member]
Revenue from contracts with customers		995	1,091
Auto Finance [Member] | Credit and Debit Card [Member]
Revenue from contracts with customers	[1]
Auto Finance [Member] | Servicing Income [Member]
Revenue from contracts with customers		929	1,022
Auto Finance [Member] | Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		$ 66	$ 69

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