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Note 9 - Notes Payable (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2023 | Sep. 30, 2022 | Aug. 31, 2022 | May 31, 2022 | Nov. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Oct. 31, 2020 | Jul. 31, 2020 | Nov. 30, 2019 | Oct. 31, 2016 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Jan. 31, 2021 | Aug. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2015
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  | $ 1,642,129,000 |  |  | $ 1,642,129,000 |  | $ 1,630,111,000 |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  | $ 100,000,000.0 |  |  | $ 300,000,000.0 |  | $ 300,000,000.0 | $ 250,000,000.0 | $ 100,000,000.0 | $ 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Backed Securities, Term of Revolving Structure (Year) |  | 3 years |  |  | 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 | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Backed Securities, Weighted Average Interest Rate |  | 7.30% |  |  | 3.53% |  | 4.24% | 4.10% | 5.47% | 4.91% |  |  |  |  |  |  |  |  |  |  |  |  |
Term Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  | 25,000,000.0 |  |  | 25,000,000.0 |  |  |  |  |  |  |  |
Second Term Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 75,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  | 0.0 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,400,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  | $ 400,000 | 700,000 | $ 700,000 |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 786,000 |  |  | $ 786,000 |  |  |  |  |  |  |  |
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% |  |  | 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 | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 | $ 50,000,000.0
Long-Term Line of Credit | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  | $ 49,900,000 |  |  | $ 49,900,000 |  |  |  |  |  |  |  |
Secured by the Financial and Operating Assets of CAR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | 65,000,000.0 |  |  | 65,000,000.0 |  |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  | 46,300,000 |  |  | 46,300,000 |  |  |  |  |  |  |  |
December 2017 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,800,000 |
Additional Trust Funding Notes Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |  |  | 100,000,000.0 |  |  |  |  |  | $ 100,000,000.0 |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  | 80,000,000.0 |  |  | 80,000,000.0 |  |  |  |  |  |  |  |
June 2019 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000.0 |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  | $ 7,400,000 |  |  | $ 7,400,000 |  |  |  |  |  |  |  |
May 2022 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000.0 |  |  |  |  |  |
Asset Backed Securities, Term of Revolving Structure (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Backed Securities, Term of Revolving Structure, Subsequent Amortization Period (Month) |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Backed Securities, Weighted Average Interest Rate |  |  |  | 6.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 |  |  |  |  |  |
Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Rate |  |  |  |  |  |  |  |  |  |  |  | 8.25% |  |  | 8.25% |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Rate |  |  |  |  |  |  |  |  |  |  |  | 5.09% |  |  | 5.09% |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Secured by the Financial and Operating Assets of CAR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Secured by the Financial and Operating Assets of CAR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | December 2017 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.60% |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Additional Trust Funding Notes Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10% |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | August 2022 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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