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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
Sep. 30, 2019
Sep. 30, 2018
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross $ 45,820,954 $ 42,396,025
Less accumulated depreciation and amortization: Owned property and equipment (28,165,539) (26,627,541)
Property and equipment, net 17,655,415 15,768,484
Land    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross 773,068 773,068
Buildings and improvements    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross 12,574,893 12,206,908
Warehouse equipment    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross 15,011,605 13,424,236
Furniture, fixtures and leasehold improvements    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross 13,155,606 12,018,984
Vehicles    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross 3,687,901 3,229,551
Construction in progress    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, gross $ 617,881 $ 743,278