Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Allowance for Uncollectible Loans and Fees Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Balance at beginning of period	$ (1,600)	$ (105,900)	$ (57,200)	$ (125,000)
Provision for loan losses	(182)	(11,096)	(329)	(15,231)
Charge-offs	400	27,800	800	54,700
Recoveries	(200)	(6,000)	(500)	(9,700)
Balance at end of period	(1,600)	(95,200)	(1,600)	(95,200)
Balance at end of period individually evaluated for impairment	0		0		$ (100)
Balance at end of period collectively evaluated for impairment	(1,600)		(1,600)		(57,100)
Loans, interest and fees receivable, gross	104,563		104,563		470,293
Loans, interest and fees receivable individually evaluated for impairment	0		0		400
Loans, interest and fees receivable collectively evaluated for impairment	104,600		104,600		469,900
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of Fair Value Under the CECL Standard [Member]
Balance at beginning of period			55,800
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period			(200)
Credit Card Receivable [Member]
Balance at beginning of period	0	(75,100)	(43,400)	(88,200)
Provision for loan losses	0	(11,000)	0	(15,200)
Charge-offs	0	21,200	0	40,200
Recoveries	0	(3,100)	0	(4,800)
Balance at end of period	0	(68,000)	0	(68,000)
Balance at end of period individually evaluated for impairment	0		0		0
Balance at end of period collectively evaluated for impairment	0		0		(43,400)
Loans, interest and fees receivable, gross	0		0		259,500
Loans, interest and fees receivable individually evaluated for impairment	0		0		0
Loans, interest and fees receivable collectively evaluated for impairment	0		0		259,500
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
Credit Card Receivable [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period			0
Automobile Loan [Member]
Balance at beginning of period	(1,600)	(1,500)	(1,400)	(1,700)
Provision for loan losses	(200)	200	(300)	100
Charge-offs	400	200	800	800
Recoveries	(200)	(300)	(500)	(600)
Balance at end of period	(1,600)	(1,400)	(1,600)	(1,400)
Balance at end of period individually evaluated for impairment	0		0		(100)
Balance at end of period collectively evaluated for impairment	(1,600)		(1,600)		(1,300)
Loans, interest and fees receivable, gross	104,600		104,600		94,600
Loans, interest and fees receivable individually evaluated for impairment	0		0		400
Loans, interest and fees receivable collectively evaluated for impairment	104,600		104,600		94,200
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
Automobile Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period			(200)
Other Unsecured Lending Products [Member]
Balance at beginning of period	0	(29,300)	(12,400)	(35,100)
Provision for loan losses	0	(300)	0	(100)
Charge-offs	0	6,400	0	13,700
Recoveries	0	(2,600)	0	(4,300)
Balance at end of period	0	$ (25,800)	0	$ (25,800)
Balance at end of period individually evaluated for impairment	0		0		0
Balance at end of period collectively evaluated for impairment	0		0		(12,400)
Loans, interest and fees receivable, gross	0		0		116,200
Loans, interest and fees receivable individually evaluated for impairment	0		0		0
Loans, interest and fees receivable collectively evaluated for impairment	$ 0		0		$ 116,200
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
Other Unsecured Lending Products [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adoption of the CECL Standard [Member]
Balance at beginning of period			$ 0