Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Statutory surplus reserves (Details)

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STOCKHOLDERS' EQUITY - Statutory surplus reserves (Details)
12 Months Ended
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 29, 2015
Number of warrants issued | shares 5,091,540      
Class of warrant or right, outstanding | shares 4,774,642 74,784    
Statutory surplus reserve $ 2,914,602 $ 2,904,699    
Net loss $ (3,802,271) (837,016) $ 8,193,694  
Retained earnings, appropriated   7,208,369    
Term        
Fair value 2.0      
Volatility        
Fair value 80      
Risk-free rate        
Fair value 0.20      
Statutory surplus reserve        
Net loss $ 9,903 9,903 $ 872,924  
Retained earnings, appropriated   $ 7,198,466    
Minimum        
Statutory surplus reserves percentage 10.00%      
Maximum        
Statutory surplus reserves percentage   50.00%    
ZK Uganda        
Noncontrolling interest, ownership percentage by parent 20.00%      
Wenzhou Weijia        
Noncontrolling interest, ownership percentage by parent 99.00%     99.00%
HUANG Jian Cong        
Ownership interest held by non-controlling interest 1.00%      
Third Party Individual        
Ownership interest 49.00%      
WANG Ming Jie | Subsidiary One        
Ownership interest 16.82%      
WANG Guo Lin | Subsidiary One        
Ownership interest 6.22%      
ZK International | Subsidiary Two        
Ownership interest 100.00%