XML 29 R19.htm IDEA: XBRL DOCUMENT v3.21.1
Summary of Significant Accounting Policies (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 10, 2020
$ / shares
Sep. 04, 2020
$ / shares
Jan. 01, 2018
Dec. 22, 2017
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Number of business segments                        
Number of business segments in which the entity operates | segment               1        
Long-Lived Assets                        
Impairment charges         $ 0     $ 0        
Contract Balances                        
Balance at beginning of the period (contract liabilities)           $ 313,365   313,365        
Amount transferred to receivables from contract assets               0        
Contract asset additions               0        
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period               (292,712)        
Increases due to invoicing prior to satisfaction of performance obligations               71,419        
Balance at end of the period (contract liabilities)         92,072     92,072   $ 313,365    
Customer Service Revenue                        
Customer Service Cost of Sales         2,218,854   $ 2,539,894 4,522,683 $ 4,449,675      
Gross profit         2,902,991   2,295,171 $ 5,468,814 4,896,818      
Income Taxes                        
U.S. Federal statutory tax rate (as a percent)     21.00% 34.00%       21.00%        
Net operating losses (as a percent)                     80.00%  
Deferred income tax expense                     $ 321,038  
Engineering Development                        
Percentage of employees who were engineers engaged in various engineering development projects               22.00%        
Warranty                        
Length of warranty period               24 months        
Self-Insurance Reserves                        
Estimated liability for medical claims incurred but not reported         44,600     $ 44,600   48,200    
Excess of funded premiums over estimated claims incurred but not reported         233,200     233,200   225,200    
Restricted Cash                        
Cash dividends declared per share | $ / shares $ 0.50 $ 0.65                    
Total cash dividend payment               8,600,000   11,200,000    
Dividends paid           $ 8,607,192 0   0      
Cash and cash equivalents         5,997,691     5,997,691   12,603,967    
Restricted cash         0     0   11,180,900    
Total cash and cash equivalents and restricted cash         5,997,691   22,644,037 5,997,691 22,644,037 $ 23,784,867   $ 22,416,830
Customer Service                        
Customer Service Revenue                        
Customer Service Sales         1,214,372   1,206,644 2,029,875 2,395,684      
Customer Service Cost of Sales         354,664   402,354 671,301 751,969      
Gross profit         $ 859,708   $ 804,290 $ 1,358,574 $ 1,643,715      
Property and equipment except manufacturing facility and the corporate airplane | Minimum                        
Number of business segments                        
Estimated useful lives               3 years        
Property and equipment except manufacturing facility and the corporate airplane | Maximum                        
Number of business segments                        
Estimated useful lives               7 years        
Manufacturing facility                        
Number of business segments                        
Estimated useful lives               39 years        
Corporate airplanes                        
Number of business segments                        
Estimated useful lives               10 years