Note 9 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment, Gross	$ 86,068	$ 96,928
Accumulated depreciation and impairment	(62,020)	(70,330)
Property, Plant and Equipment, Net	24,048	26,598
Land and Land Improvements [Member]
Property, Plant and Equipment, Gross	7,069	7,855
Building and Building Improvements [Member]
Property, Plant and Equipment, Gross	21,931	24,588
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	48,877	59,393
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	1,487	1,434
Tools, Dies and Molds [Member]
Property, Plant and Equipment, Gross	3,287	3,243
Construction in Progress [Member]
Property, Plant and Equipment, Gross	3,343	341
Transportation Equipment [Member]
Property, Plant and Equipment, Gross	$ 74	$ 74