Note 19 - Segment and Geographic Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Revenue	$ 124,509	$ 89,253
Income (loss) from operations	11,328	(23,136)
Depreciation and amortization	16,238	19,560
Impairment, inventory obsolescence and stock-based compensation expenses	3,603	9,694
Interest income	539	976
Interest expense	134	65
Corporate, Non-Segment [Member]
Revenue	243	230
Income (loss) from operations	(11,918)	(12,490)
Depreciation and amortization	542	802
Impairment, inventory obsolescence and stock-based compensation expenses	566	727
Interest income	187	126
Interest expense	29	0
Oil and Gas Markets [Member] | Operating Segments [Member]
Revenue	73,993	49,141
Income (loss) from operations	15,759	(7,539)
Depreciation and amortization	14,428	16,947
Impairment, inventory obsolescence and stock-based compensation expenses	2,329	3,612
Interest income	352	850
Interest expense	105	65
Adjacent Markets [Member] | Operating Segments [Member]
Revenue	49,039	39,171
Income (loss) from operations	11,490	6,021
Depreciation and amortization	703	743
Impairment, inventory obsolescence and stock-based compensation expenses	656	932
Interest income	0	0
Interest expense	0	0
Emerging Markets [Member] | Operating Segments [Member]
Revenue	1,234	711
Income (loss) from operations	(4,003)	(9,128)
Depreciation and amortization	565	1,068
Impairment, inventory obsolescence and stock-based compensation expenses	52	4,423
Interest income	0	0
Interest expense	$ 0	$ 0