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Revenue Recognition (Tables)
9 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue

The following tables provide details of revenue by major products group:

 

Product group  Fiscal 2019   Fiscal 2018 
Microwave Filter (MFC):          
RF/Microwave  $1,115,731   $950,099 
Satellite   632,505    877,520 
Cable TV   361,551    246,854 
Broadcast TV   636,158    244,261 
Niagara Scientific (NSI):   84    4,837 
Total  $2,746,029   $2,323,571 
           
Sales backlog at June 30  $741,835   $1,193,829