Note 12 - Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Goodwill, gross	$ 5,594	$ 5,072
Goodwill, gross	5,594	5,072
Goodwill, accumulated impairment losses	(4,336)	(4,336)
Goodwill, net	$ 1,258	736
Weighted average remaining useful life (Year)	3 years 9 months 18 days
Other intangible assets, gross	$ 12,107	8,383
Accumulated amortization	(6,952)	(6,734)
Finite-Lived Intangible Assets, Net	$ 5,155	1,649
Developed Technology Rights [Member]
Weighted average remaining useful life (Year)	6 years 1 month 6 days
Other intangible assets, gross	$ 5,575	2,275
Customer Relationships [Member]
Weighted average remaining useful life (Year)	1 month 6 days
Other intangible assets, gross	$ 3,955	3,900
Trade Names [Member]
Weighted average remaining useful life (Year)	8 months 12 days
Other intangible assets, gross	$ 2,332	2,022
Noncompete Agreements [Member]
Weighted average remaining useful life (Year)	10 months 24 days
Other intangible assets, gross	$ 245	186
Intelligent Industrial [Member]
Goodwill, gross	4,858	4,336
Goodwill, gross	4,858	4,336
Goodwill, net	500
Finite-Lived Intangible Assets, Net	3,700
Smart Water [Member]
Goodwill, gross	736	736
Goodwill, gross	736	$ 736
Goodwill, net	700
Finite-Lived Intangible Assets, Net	$ 400