Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 50,182	$ 55,118
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Sales	(25)	(55)
Telco | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		32,204
Wireless Services
Disaggregation of Revenue [Line Items]
Sales	21,354	22,919
Equipment Sales | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Sales	(25)	(55)
Equipment Sales | Telco | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	27,109	29,391
Telco Repair
Disaggregation of Revenue [Line Items]
Sales	68	43
Telco Recycle
Disaggregation of Revenue [Line Items]
Sales	$ 1,676	$ 2,820