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Note 10 - Notes Payable (Details Textual) - USD ($) $ in Thousands	1 Months Ended							5 Months Ended	9 Months Ended	12 Months Ended
	Nov. 30, 2021	Sep. 30, 2021	Jun. 30, 2021	Oct. 31, 2020	Jul. 31, 2020	Nov. 30, 2019	Jun. 30, 2019	May 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Jan. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Aug. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 28, 2017	Oct. 31, 2015
Long-term Line of Credit, Total										$ 1,255,518		$ 857,068
Proceeds from Issuance of Long-term Debt, Total	$ 300,000		$ 300,000	$ 250,000	$ 100,000	$ 200,000	$ 200,000
Asset Backed Securities, Term of Revolving Structure (Year)	3 years	24 months	4 years	41 months	3 years	3 years
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period (Month)	18 months			18 months	18 months
Asset Backed Securities, Weighted Average Interest Rate	3.53%		4.24%	4.10%	5.47%	4.91%
Term Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 75,000							$ 75,000		$ 15,000
Long-term Line of Credit, Total		$ 0	$ 10,000						$ 0
Debt Instrument, Interest Rate, Stated Percentage		2.75%							2.75%
Term Note [Member]
Long-term Debt, Total														$ 17,400
Debt Instrument, Interest Rate, Stated Percentage														8.00%
Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.125%
Debt Instrument, Face Amount	$ 150,000
Amortization of Debt Issuance Costs										100
Minimum [Member]
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period (Month)			11 months			12 months
Minimum [Member] | Term Facility [Member]
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Maximum [Member]
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period (Month)			18 months			18 months
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																		$ 50,000
Long-term Line of Credit, Total										48,700
Revolving Credit Facility [Member] | Term Note [Member]
Line of Credit Facility, Maximum Borrowing Capacity													$ 30,000
Secured by the Financial and Operating Assets of CAR [Member]
Line of Credit Facility, Maximum Borrowing Capacity										55,000
Long-term Line of Credit, Total										32,100
Trust Funding Notes Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 70,000									$ 90,000
Trust Funding Notes Facility [Member] | Other Nonoperating Income (Expense) [Member]
Removal of Accrual Related to Contingent Liability								$ 1,500
Additional Trust Funding Notes Facilities [Member]
Line of Credit Facility, Maximum Borrowing Capacity															$ 200,000
Long-term Line of Credit, Total										0
December 2017 Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																$ 25,000
Long-term Line of Credit, Total										19,200
June 2019 Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 15,000
Long-term Line of Credit, Total										$ 5,700
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Variable Rate										0.10%
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] | 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] | Additional Trust Funding Notes Facilities [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate									4.50%
London Interbank Offered Rate (LIBOR) [Member] | Additional Trust Funding Notes Facilities [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate									6.50%
London Interbank Offered Rate (LIBOR) [Member] | December 2017 Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate									3.50%
Prime Rate [Member]
Debt Instrument, Variable Rate										3.25%
Commercial Paper Rates [Member] | Additional Trust Funding Notes Facilities [Member]
Debt Instrument, Basis Spread on Variable Rate									3.15%

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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