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, 2022	Dec. 31, 2021	Dec. 31, 2020
Balance at beginning of period	$ (57,200)	$ (125,000)	$ (186,300)
Provision for credit losses	(1,252)	(36,455)	(142,719)
Charge-offs	2,600	121,200	230,200
Recoveries	(1,300)	(16,900)	(26,200)
Balance at end of period	(1,600)	(57,200)	(125,000)
Balance at end of period individually evaluated for impairment	0	(100)	(300)
Balance at end of period collectively evaluated for impairment	(1,600)	(57,100)	(124,700)
Loans, interest and fees receivable, gross	105,267	470,293	667,600
Loans, interest and fees receivable individually evaluated for impairment	0	400	2,300
Loans, interest and fees receivable collectively evaluated for impairment	105,300	469,900	665,300
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]
Balance at beginning of period	55,800
Balance at end of period		55,800
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period	(200)
Balance at end of period		(200)
Credit Card Receivable [Member]
Balance at beginning of period	(43,400)	(88,200)	(121,300)
Provision for credit losses	0	(34,900)	(112,100)
Charge-offs	0	88,600	155,100
Recoveries	0	(8,900)	(9,900)
Balance at end of period	0	(43,400)	(88,200)
Balance at end of period individually evaluated for impairment	0	0	0
Balance at end of period collectively evaluated for impairment	0	(43,400)	(88,200)
Loans, interest and fees receivable, gross	0	259,500	364,200
Loans, interest and fees receivable individually evaluated for impairment	0	0	0
Loans, interest and fees receivable collectively evaluated for impairment	0	259,500	364,200
Credit Card Receivable [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]
Balance at beginning of period	43,400
Balance at end of period		43,400
Credit Card Receivable [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period	0
Balance at end of period		0
Automobile Loan [Member]
Balance at beginning of period	(1,400)	(1,700)	(1,600)
Provision for credit losses	(1,300)	(200)	(2,000)
Charge-offs	2,600	1,500	3,000
Recoveries	(1,300)	(1,000)	(1,100)
Balance at end of period	(1,600)	(1,400)	(1,700)
Balance at end of period individually evaluated for impairment	0	(100)	(300)
Balance at end of period collectively evaluated for impairment	(1,600)	(1,300)	(1,400)
Loans, interest and fees receivable, gross	105,300	94,600	93,200
Loans, interest and fees receivable individually evaluated for impairment	0	400	2,300
Loans, interest and fees receivable collectively evaluated for impairment	105,300	94,200	90,900
Automobile Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]
Balance at beginning of period	0
Balance at end of period		0
Automobile Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period	(200)
Balance at end of period		(200)
Other Unsecured Lending Products [Member]
Balance at beginning of period	(12,400)	(35,100)	(63,400)
Provision for credit losses	0	(1,400)	(28,600)
Charge-offs	0	31,100	72,100
Recoveries	0	(7,000)	(15,200)
Balance at end of period	0	(12,400)	(35,100)
Balance at end of period individually evaluated for impairment	0	0	0
Balance at end of period collectively evaluated for impairment	0	(12,400)	(35,100)
Loans, interest and fees receivable, gross	0	116,200	210,200
Loans, interest and fees receivable individually evaluated for impairment	0	0	0
Loans, interest and fees receivable collectively evaluated for impairment	0	116,200	$ 210,200
Other Unsecured Lending Products [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]
Balance at beginning of period	12,400
Balance at end of period		12,400
Other Unsecured Lending Products [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period	$ 0
Balance at end of period		$ 0