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Revenue Recognition and Related Costs (Tables)
 3 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Company's Net Revenue by Major Source The following table disaggregates the Company’s net revenue by major source for the quarters ended December 31, 2020 and 2019:
     Quarter Ended December 31,  
     2020      2019  
Equipment sales recognized over time
    $ 4,132,000      $ 12,090,000  
Equipment sales recognized at a point in time
      10,136,000        1,907,000  
Parts and component sales
      3,931,000        3,146,000  
Freight revenue
      745,000        903,000  
Other
      20,000        (16,000 ) 
    
 
 
     
 
 
  
Net revenue
    $ 18,964,000      $ 18,030,000