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Note 6 - Leases - Lease Costs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Operating leases (Year) | 5 years 8 months 12 days |  | 6 years 1 month 6 days
Financing leases (Year) | 2 years 6 months |  | 2 years 3 months 18 days
Operating leases | 5.70% |  | 5.00%
Financing leases | 4.40% |  | 3.20%
Total lease expense | $ 10,100 |  | $ 9,651
Selling, General and Administrative Expenses [Member] |  |  |
Operating lease cost(1) | 7,893 | [1] | 7,182
Depreciation of property | 124 |  | 127
Short-term lease cost(2) | 2 | [2] | 325
Variable lease cost(3) | 2,365 | [3] | 2,303
Less: Sublease income | (288) |  | (293)
Interest Income [Member] |  |  |
Interest on lease liabilities | $ 4 |  | $ 7
[1] | Operating lease costs include costs associated with fixed lease payments and index-based variable payments that qualified for lease accounting under ASC 842, Leases and complied with the practical expedients we elected. Expense related to fixed lease payments are recognized on a straight-line basis over the lease term.
[2] | Leases with an initial term of 12 months or less are not recorded on the balance sheet and instead expensed on a straight-line basis over the lease term.
[3] | Variable lease costs include costs that were not fixed at the lease commencement date and are not dependent on an index or rate. Variable lease payments are generally expensed as incurred, where applicable, and include certain non-lease components, such as maintenance, utilities, real estate taxes, insurance and other services provided by the lessor, and other charges included in the lease. In addition, certain of our equipment lease agreements include variable lease payments, which are based on the usage of the underlying asset. The variable portion of payments are not included in the initial measurement of the asset or lease liability due to uncertainty of the payment amount and are recorded as expense in the period incurred.

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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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