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Segment Reporting (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Total sales $ 12,749 $ 13,962  
Total gross profit 3,629 3,592  
Total loss from operations (1,914) (1,763)  
Segment assets 29,971   $ 32,503
Operating segments      
Segment Reporting Information [Line Items]      
Total sales 12,749 13,962  
Total gross profit 3,629 3,592  
Total loss from operations (1,914) (1,763)  
Non-allocated      
Segment Reporting Information [Line Items]      
Segment assets 11,031   14,881
Wireless | Operating segments      
Segment Reporting Information [Line Items]      
Total sales 5,247 6,798  
Total gross profit 1,609 1,873  
Total loss from operations (809) (782)  
Wireless | Operating segments | Continuing Operations      
Segment Reporting Information [Line Items]      
Segment assets 5,141   5,324
Telco | Operating segments      
Segment Reporting Information [Line Items]      
Total sales 7,502 7,164  
Total gross profit 2,020 1,719  
Total loss from operations (1,105) $ (981)  
Telco | Operating segments | Continuing Operations      
Segment Reporting Information [Line Items]      
Segment assets $ 13,799   $ 12,298