Note 12 - Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 25,858	$ 32,715	$ 100,160	$ 95,194
Income (loss) from operations	(2,393)	3,146	5,938	7,244
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	74	72	223	170
Income (loss) from operations	(3,604)	(3,391)	(10,255)	(8,457)
Oil and Gas Markets [Member] | Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	9,174	17,672	59,930	56,239
Income (loss) from operations	(2,302)	3,238	9,126	9,820
Adjacent Markets [Member] | Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	15,970	14,862	38,020	38,392
Income (loss) from operations	4,661	4,346	9,491	9,148
Emerging Markets [Member] | Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	640	109	1,987	393
Income (loss) from operations	$ (1,148)	$ (1,047)	$ (2,424)	$ (3,267)