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Subsequent Events (Details) - USD ($)
Feb. 08, 2022
Feb. 10, 2022
Jan. 24, 2022
Jan. 07, 2022
Dec. 31, 2021
Mar. 31, 2021
Nov. 20, 2020
Subsequent Event              
Long-term debt, gross         $ 109,447,000 $ 88,637,000  
Unsecured Debt | Contrail Aviation Inc.              
Subsequent Event              
Long-term debt, gross         $ 46,421,000 $ 43,598,000 $ 43,600,000
Subsequent Event              
Subsequent Event              
Employee retention credit, CARES Act     $ 9,100,000        
Subsequent Event | Air T Acquisition 22.1, LLC | Trust Preferred Capital Security              
Subsequent Event              
Pledged asset $ 5,000,000            
Cumulative dividend rate (percent) 8.00%            
Subsequent Event | Air T Acquisition 22.1, LLC | Trust Preferred Capital Security | GdW Beheer B.V.              
Subsequent Event              
Ownership interest acquired (percent)   70.00%          
Subsequent Event | Unsecured Debt | Contrail Aviation Inc.              
Subsequent Event              
Interest rate stated percentage (as a percentage)       4.68%      
Subsequent Event | Notes Payable to Banks | Air T Acquisition 22.1, LLC | Bridgewater              
Subsequent Event              
Interest rate stated percentage (as a percentage) 4.00%            
Principle amount $ 5,000,000            
Periodic payments $ 500,000