Property, Plant and Equipment (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 19,706,000	$ 19,127,000
Less accumulated depreciation	(12,113,000)	(11,029,000)
Property, Plant and Equipment, Net, Total	7,593,000	8,098,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	151,000	158,000
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,743,000	3,591,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,458,000	14,086,000
Office furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,354,000	1,239,000
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 53,000