Note 7 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Property, Plant and Equipment, Gross	$ 84,656	$ 96,928
Accumulated depreciation and impairment	(61,966)	(70,330)
Property, Plant and Equipment, Net	22,690	26,598
Land and Land Improvements [Member]
Property, Plant and Equipment, Gross	7,290	7,855
Building and Building Improvements [Member]
Property, Plant and Equipment, Gross	21,903	24,588
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	49,657	59,393
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	1,489	1,434
Tools, Dies and Molds [Member]
Property, Plant and Equipment, Gross	3,280	3,243
Construction in Progress [Member]
Property, Plant and Equipment, Gross	962	341
Transportation Equipment [Member]
Property, Plant and Equipment, Gross	$ 75	$ 74