Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Allowance for Uncollectible Loans and Fees Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for uncollectible loans, interest and fees receivable:
Balance at beginning of period	$ (79,200)	$ (63,000)
Provision for loan losses	(248,383)	(100,338)
Charge offs	152,900	90,300
Recoveries	(11,600)	(6,200)
Balance at end of period	(186,300)	(79,200)
Balance at end of period individually evaluated for impairment	(500)	(300)
Balance at end of period collectively evaluated for impairment	(185,800)	(78,900)
Loans, interest and fees receivable:
Loans, interest and fees receivable, gross	998,209	541,344
Loans, interest and fees receivable individually evaluated for impairment	2,200	500
Loans, interest and fees receivable collectively evaluated for impairment	996,000	540,800
Credit Card Receivable [Member]
Allowance for uncollectible loans, interest and fees receivable:
Balance at beginning of period	(35,400)	(18,200)
Provision for loan losses	(161,500)	(46,600)
Charge offs	80,200	29,900
Recoveries	(4,600)	(500)
Balance at end of period	(121,300)	(35,400)
Balance at end of period individually evaluated for impairment
Balance at end of period collectively evaluated for impairment	(121,300)	(35,400)
Loans, interest and fees receivable:
Loans, interest and fees receivable, gross	509,200	188,600
Loans, interest and fees receivable individually evaluated for impairment
Loans, interest and fees receivable collectively evaluated for impairment	509,200	188,600
Automobile Loan [Member]
Allowance for uncollectible loans, interest and fees receivable:
Balance at beginning of period	(1,300)	(2,300)
Provision for loan losses	(3,500)	(300)
Charge offs	4,600	2,200
Recoveries	(1,400)	(900)
Balance at end of period	(1,600)	(1,300)
Balance at end of period individually evaluated for impairment	(400)	(200)
Balance at end of period collectively evaluated for impairment	(1,200)	(1,100)
Loans, interest and fees receivable:
Loans, interest and fees receivable, gross	89,800	88,100
Loans, interest and fees receivable individually evaluated for impairment	2,100	400
Loans, interest and fees receivable collectively evaluated for impairment	87,700	87,700
Other Unsecured Lending Products [Member]
Allowance for uncollectible loans, interest and fees receivable:
Balance at beginning of period	(42,500)	(42,500)
Provision for loan losses	(83,400)	(53,400)
Charge offs	68,100	58,200
Recoveries	(5,600)	(4,800)
Balance at end of period	(63,400)	(42,500)
Balance at end of period individually evaluated for impairment	(100)	(100)
Balance at end of period collectively evaluated for impairment	(63,300)	(42,400)
Loans, interest and fees receivable:
Loans, interest and fees receivable, gross	399,200	264,600
Loans, interest and fees receivable individually evaluated for impairment	100	100
Loans, interest and fees receivable collectively evaluated for impairment	$ 399,100	$ 264,500