Note 8 - Supplementary Balance Sheet Information - Schedule of Warranty and Retrofit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Balance at beginning of period	$ 5,213	$ 3,974
Accruals for warranties during the period	187	903
Costs incurred during the period	(427)	(320)
Balance at end of period	$ 4,973	$ 4,557

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Amount of increase in the standard and extended product warranty accrual from warranties issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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