Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Aging of Delinquent Loans and Fees Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Delinquent loans and fees receivable, gross	$ 75,500	$ 73,400
Current loans, interest and fees receivable, gross	487,000	467,900
Loans, interest and fees receivable, gross	562,472	541,344
Balance of loans greater than 90-days delinquent still accruing interest and fees	2,000	1,500
Financial Asset, 30 to 59 Days Past Due [Member]
Delinquent loans and fees receivable, gross	21,600	24,700
Financial Asset, 60 to 89 Days Past Due [Member]
Delinquent loans and fees receivable, gross	15,700	15,700
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Delinquent loans and fees receivable, gross	38,200	33,000
Credit Card Receivable [Member]
Delinquent loans and fees receivable, gross	32,000	24,700
Current loans, interest and fees receivable, gross	179,400	163,900
Loans, interest and fees receivable, gross	211,400	188,600
Balance of loans greater than 90-days delinquent still accruing interest and fees
Credit Card Receivable [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Delinquent loans and fees receivable, gross	8,300	7,100
Credit Card Receivable [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Delinquent loans and fees receivable, gross	6,700	5,300
Credit Card Receivable [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Delinquent loans and fees receivable, gross	17,000	12,300
Automobile Loan [Member]
Delinquent loans and fees receivable, gross	10,300	12,900
Current loans, interest and fees receivable, gross	79,900	75,200
Loans, interest and fees receivable, gross	90,200	88,100
Balance of loans greater than 90-days delinquent still accruing interest and fees	2,000	1,500
Automobile Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Delinquent loans and fees receivable, gross	5,500	7,900
Automobile Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Delinquent loans and fees receivable, gross	2,100	2,800
Automobile Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Delinquent loans and fees receivable, gross	2,700	2,200
Other Unsecured Lending Products [Member]
Delinquent loans and fees receivable, gross	33,200	35,800
Current loans, interest and fees receivable, gross	227,700	228,800
Loans, interest and fees receivable, gross	260,900	264,600
Balance of loans greater than 90-days delinquent still accruing interest and fees
Other Unsecured Lending Products [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Delinquent loans and fees receivable, gross	7,800	9,700
Other Unsecured Lending Products [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Delinquent loans and fees receivable, gross	6,900	7,600
Other Unsecured Lending Products [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Delinquent loans and fees receivable, gross	$ 18,500	$ 18,500