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Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Summary of Troubled Debt Restructurings (Details) $ in Thousands		12 Months Ended
		Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Point-of-Sale [Member]
Number of TDRs		22,401		14,919
Amount of TDRs on non-accrual status (in thousands)		$ 28,165		$ 17,152
Carrying value of TDRs (in thousands)		$ 15,088		11,173
Number of accounts		5,738	2,502
Loan balance at time of charge off (in thousands)		$ 9,043	$ 3,420
Point-of-Sale [Member] | Performing Financial Instruments [Member]
Carrying value of TDRs (in thousands)	[1]	11,536		8,797
Point-of-Sale [Member] | Nonperforming Financial Instruments [Member]
Carrying value of TDRs (in thousands)	[1]	$ 3,552		$ 2,376
Point-of-Sale [Member] | Extended Maturity [Member]
Number of TDRs		1,342		812
Amount of TDRs on non-accrual status (in thousands)		$ 2,584		$ 1,205
Direct-to-Consumer [Member]
Number of TDRs		84,339		39,322
Amount of TDRs on non-accrual status (in thousands)		$ 58,723		$ 25,154
Carrying value of TDRs (in thousands)		$ 23,233		15,502
Number of accounts		20,656	5,624
Loan balance at time of charge off (in thousands)		$ 16,490	$ 4,489
Direct-to-Consumer [Member] | Performing Financial Instruments [Member]
Carrying value of TDRs (in thousands)	[1]	18,667		13,387
Direct-to-Consumer [Member] | Nonperforming Financial Instruments [Member]
Carrying value of TDRs (in thousands)	[1]	$ 4,566		$ 2,115
Direct-to-Consumer [Member] | Extended Maturity [Member]
Number of TDRs		3,572		2,035
Amount of TDRs on non-accrual status (in thousands)		$ 3,102		$ 1,553
[1] TDRs - Performing” include accounts that are current on all amounts owed, while “TDRs - Nonperforming” include all accounts with past due amounts owed

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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