Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components (Details Textual) $ in Thousands, £ in Millions		12 Months Ended
	Jan. 01, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 GBP (£)
Payments to Acquire Loans and Leases Held-for-investment, Total		$ 182,900	$ 179,400
Loans and Leases Receivable, Deferred Income, Total		$ 90,307	43,897
Weighted Average Remaining Accretion Period of Deferred Revenue		330 days
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total		$ 48,100	$ 30,000
Financing Receivable, Modifications, Number of Contracts		31,409	21,997	21,997
Financing Receivable, Troubled Debt Restructuring		$ 43,300	$ 33,200
Asset Impairment Charges, Total		0	0
Proceeds from Legal Settlements			42,900	£ 34
Gain (Loss) Related to Litigation Settlement, Total			36,200
Operating Lease, Liability, Total		22,259
Operating Lease, Right-of-Use Asset		14,091
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total	$ 30,200
Operating Lease, Right-of-Use Asset	18,600
Cumulative Effect on Retained Earnings, before Tax	$ 600
Other Income [Member]
Reduction in Accruals		$ 105,900
Equity Method Investment to Acquire Portfolio of Credit Card Receivables [Member]
Equity Method Investment, Ownership Percentage		66.70%
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life		5 years
Computer Equipment [Member]
Property, Plant and Equipment, Useful Life		3 years