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Financial Statement Presentation (Details)
3 Months Ended
Apr. 10, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Minimum debt service coverage ratio   1.25    
Minimum net worth required for compliance   $ 15,000,000    
Long-term debt, gross   91,233,000 $ 86,174,000  
AIRT Small Business Administration S B A C A R E S Act Paycheck Protection Program        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Payments for (proceeds from) loans and leases $ 8,200,000      
Global Aviation Services, LLC        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Ownership percentage (as a percentage)       100.00%
Revolving Credit Facility | Contrail Aviation Inc.        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Long-term debt, gross   $ 1,600,000