Note 9 - Notes Payable and Variable Interest Entities (Details Textual) - USD ($)		1 Months Ended							4 Months Ended	12 Months Ended
	Dec. 27, 2019	Nov. 30, 2019	Jun. 30, 2019	Nov. 30, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2016	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Aug. 26, 2019	Feb. 28, 2017	Oct. 31, 2015	Nov. 26, 2014	Nov. 30, 2005
Credit Card Receivables and Restricted Cash Carrying Amount as Security for Notes Payable									$ 3,900,000	$ 3,900,000
Notes Payable Associated with Structured Financings, Fair Value									3,920,000	3,920,000	$ 5,651,000
Aggregate Exposure to Pretax Equity Loss, Structured Financing at Fair Value									0	0
Long-term Line of Credit, Total									720,687,000	720,687,000	389,707,000
Proceeds from Issuance of Long-term Debt, Total		$ 200,000,000	$ 200,000,000	$ 167,300,000						873,340,000	632,043,000
Asset Backed Securities, Term of Revolving Structure		3 years	2 years	2 years
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period				1 year 180 days
Asset Backed Securities, Weighted Average Interest Rate		4.91%	5.37%	5.76%
Convertible Debt [Member] | Five Point Eight Seven Five Percent Convertible Senior Notes Due Two Thousand Thirty Five [Member]
Debt Instrument, Interest Rate, Stated Percentage																	5.875%
Debt Instrument, Face Amount									$ 33,839,000	$ 33,839,000	$ 88,280,000		$ 54,400,000				$ 300,000,000
Debt Instrument, Repurchase Amount													$ 16,300,000
Term Note [Member]
Debt Instrument, Interest Rate, Stated Percentage													8.00%
Long-term Debt, Total													$ 17,400,000
Minimum [Member]
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period		1 year	1 year
Maximum [Member]
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period		1 year 180 days	1 year 180 days
Debt Satisfied By Issuance of Series A Preferred Stock [Member]
Debt Conversion, Original Debt, Amount	$ 40,000,000
Series A Preferred Stock [Member]
Temporary Equity, Shares Issued	400,000								400,000	400,000	0
Temporary Equity, Liquidation Preference	$ 40,000,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity															$ 50,000,000
Long-term Line of Credit, Total									$ 40,500,000	$ 40,500,000
Revolving Credit Facility [Member] | Term Note [Member]
Line of Credit Facility, Maximum Borrowing Capacity												$ 30,000,000
Long-term Line of Credit, Total									10,000,000	10,000,000
Secured by the Financial and Operating Assets of CAR [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 40,000,000	55,000,000	55,000,000
Long-term Line of Credit, Total									39,100,000	$ 39,100,000
Line of Credit Facility, Expiration Date										Nov. 01, 2021
December 2016 Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 20,000,000
Long-term Line of Credit, Total									19,400,000	$ 19,400,000
Trust Funding Notes Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									70,000,000	70,000,000				$ 90,000,000
Long-term Line of Credit, Total									25,800,000	25,800,000
Trust Funding Notes Facility [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage														14.00%
December 2017 Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 15,000,000
Long-term Line of Credit, Total									8,600,000	8,600,000
Additional Trust Funding Notes Facilities [Member]
Line of Credit Facility, Maximum Borrowing Capacity											$ 200,000,000
Long-term Line of Credit, Total									0	0
September 2018 Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 50,000,000
Long-term Line of Credit, Total									15,000,000	15,000,000
June 2019 Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 15,000,000
Long-term Line of Credit, Total									$ 14,600,000	$ 14,600,000
Additional Trust Funding Notes Facility One [Member]
Line of Credit Facility, Expiration Date										Jun. 11, 2021
Additional Trust Funding Notes Facility Two [Member]
Line of Credit Facility, Expiration Date										Nov. 16, 2020
Dove Ventures, LLC [Member] | Senior Secured Term Loan Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																$ 40,000,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Variable Rate									1.75%	1.75%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate										3.00%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Term Note [Member]
Debt Instrument, Basis Spread on Variable Rate									4.50%
London Interbank Offered Rate (LIBOR) [Member] | Secured by the Financial and Operating Assets of CAR [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate								2.40%
London Interbank Offered Rate (LIBOR) [Member] | Secured by the Financial and Operating Assets of CAR [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate								3.00%
London Interbank Offered Rate (LIBOR) [Member] | December 2016 Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate							5.00%
London Interbank Offered Rate (LIBOR) [Member] | December 2017 Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate						3.50%
London Interbank Offered Rate (LIBOR) [Member] | Additional Trust Funding Notes Facilities [Member]
Debt Instrument, Basis Spread on Variable Rate										4.875%
London Interbank Offered Rate (LIBOR) [Member] | September 2018 Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate					6.50%
Prime Rate [Member]
Debt Instrument, Variable Rate									4.75%	4.75%
Commercial Paper Rates [Member] | Additional Trust Funding Notes Facilities [Member]
Debt Instrument, Basis Spread on Variable Rate										3.75%