Note 20 - Segment and Geographic Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Revenue	$ 135,598	$ 124,509
Income (loss) from operations	7,117	11,328
Depreciation and amortization	14,766	16,238
Impairment, inventory obsolescence and stock-based compensation expenses	4,654	3,603
Interest income	1,558	539
Interest expense	187	134
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenue	296	243
Income (loss) from operations	(13,976)	(11,918)
Depreciation and amortization	388	542
Impairment, inventory obsolescence and stock-based compensation expenses	642	566
Interest income	1,243	187
Interest expense	170	29
Oil and Gas Markets [Member] | Operating Segments [Member]
Revenue	77,455	73,993
Income (loss) from operations	13,134	15,759
Depreciation and amortization	13,243	14,428
Impairment, inventory obsolescence and stock-based compensation expenses	993	2,329
Interest income	315	352
Interest expense	17	105
Adjacent Markets [Member] | Operating Segments [Member]
Revenue	55,625	49,039
Income (loss) from operations	14,152	11,490
Depreciation and amortization	860	703
Impairment, inventory obsolescence and stock-based compensation expenses	221	656
Interest income	0	0
Interest expense	0	0
Emerging Markets [Member] | Operating Segments [Member]
Revenue	2,222	1,234
Income (loss) from operations	(6,193)	(4,003)
Depreciation and amortization	275	565
Impairment, inventory obsolescence and stock-based compensation expenses	2,798	52
Interest income	0	0
Interest expense	$ 0	$ 0