Note 3 - Segment Reporting - Summary of Operating Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Consumer loans, including past due fees	$ 260,832	$ 160,968
Other	386	200
Total interest income	261,218	161,168
Interest expense	(50,730)	(36,896)
Net interest income before fees and related income on earning assets and provision for losses on loans, interest and fees receivable	210,488	124,272
Fees and related income on earning assets	71,147	29,992
Revenue from contracts with customers	13,754	5,556
Gain on repurchase of convertible senior notes	5,127
Equity in income of equity-method investee	1,001	581
Income before income taxes	31,763	3,482
Income tax benefit (expense)	(5,553)	4,130
Assets, Total	936,266	582,608
Servicing Income [Member]
Revenue from contracts with customers	1,786	1,969
Credit and Other Investments [Member]
Consumer loans, including past due fees	229,388	131,096
Other	386	200
Total interest income	229,774	131,296
Interest expense	(49,065)	(35,564)
Net interest income before fees and related income on earning assets and provision for losses on loans, interest and fees receivable	180,709	95,732
Fees and related income on earning assets	70,984	29,912
Revenue from contracts with customers	12,759	4,465
Gain on repurchase of convertible senior notes	5,127
Equity in income of equity-method investee	1,001	581
Income before income taxes	25,005	(6,767)
Income tax benefit (expense)	(3,830)	6,345
Assets, Total	856,354	507,232
Credit and Other Investments [Member] | Servicing Income [Member]
Revenue from contracts with customers	857	947
Auto Finance [Member]
Consumer loans, including past due fees	31,444	29,872
Other
Total interest income	31,444	29,872
Interest expense	(1,665)	(1,332)
Net interest income before fees and related income on earning assets and provision for losses on loans, interest and fees receivable	29,779	28,540
Fees and related income on earning assets	163	80
Revenue from contracts with customers	995	1,091
Gain on repurchase of convertible senior notes
Equity in income of equity-method investee
Income before income taxes	6,758	10,249
Income tax benefit (expense)	(1,723)	(2,215)
Assets, Total	79,912	75,376
Auto Finance [Member] | Servicing Income [Member]
Revenue from contracts with customers	$ 929	$ 1,022