Note 7 - Rental Equipment - Rental Equipment (Details) - Equipment [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Rental equipment, primarily wireless recording equipment	$ 76,909	$ 82,926
Accumulated depreciation	(61,832)	(61,339)
Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation	$ 15,077	$ 21,587

Amount of accumulated depreciation of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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