Note 7 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Property, plant and equipment, gross	$ 83,849	$ 81,606
Accumulated depreciation and impairment	(61,660)	(60,523)
Property, plant and equipment, net	22,189	21,083
Land and Land Improvements [Member]
Property, plant and equipment, gross	2,872	4,869
Building and Building Improvements [Member]
Property, plant and equipment, gross	24,012	21,312
Machinery and Equipment [Member]
Property, plant and equipment, gross	50,065	49,860
Furniture and Fixtures [Member]
Property, plant and equipment, gross	1,276	1,470
Tools, Dies and Molds [Member]
Property, plant and equipment, gross	3,683	3,628
Construction in Progress [Member]
Property, plant and equipment, gross	1,900	392
Transportation Equipment [Member]
Property, plant and equipment, gross	$ 41	$ 75