Note 9 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Goodwill, Ending Balance	$ 736		$ 736		$ 736
Finite-Lived Intangible Assets, Net	5,143		5,143		$ 5,573
Amortization of Intangible Assets	200	$ 400	430	$ 893
Adjacent Markets [Member]
Goodwill, Ending Balance	700		700
Finite-Lived Intangible Assets, Net	600		600
Emerging Markets [Member]
Finite-Lived Intangible Assets, Net	3,200		3,200
Oil and Gas Markets [Member]
Finite-Lived Intangible Assets, Net	$ 1,400		$ 1,400