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

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Details Textual)

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CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 01, 2017
Oct. 12, 2015
Oct. 12, 2015
May 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 19, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest               68.90%  
Common Stock, Par or Stated Value Per Share             $ 1    
Stockholders' Equity Note, Stock Split             a 180 for 1 forward stock split whereby every authorized, issued and outstanding ordinary shares was exchanged for 180 new ordinary shares    
Common Stock, Shares Authorized             9,000,000 50,000,000 50,000,000
Stock Issued During Period, Value, New Issues               $ 5,582,099  
Private Placement [Member]                  
Proceeds from Issuance of Private Placement       $ 1,000,000 $ 1,000,000 $ 300,000      
Stock Issued During Period, Shares, New Issues       500,000 1,000,000 1,500,000      
Shares Issued, Price Per Share       $ 2.00 $ 1.00 $ 0.20      
Payments of Stock Issuance Costs       $ 70,000 $ 70,000 $ 21,000      
Placement Agent Fee Percentage       7.00% 7.00% 7.00%      
IPO [Member]                  
Stock Issued During Period, Shares, New Issues 1,068,346                
Shares Issued, Price Per Share $ 5.00                
Stock Issued During Period, Value, New Issues $ 5,300,000                
Proceeds from Issuance Initial Public Offering $ 3,400,000                
Parent Company [Member]                  
Number Of Shares Transferred     9,000,000            
Due from Related Parties   $ 50,000 $ 50,000         $ 0 $ 50,000
Common Stock, Par or Stated Value Per Share             $ 1 $ 0.001 $ 0.001
Stockholders' Equity Note, Stock Split             a 180 for 1 forward stock split whereby every authorized, issued and outstanding ordinary shares was exchanged for 180 new ordinary shares    
Common Stock, Shares Authorized             9,000,000 50,000,000 50,000,000
Parent Company [Member] | Private Placement [Member]                  
Proceeds from Issuance of Private Placement       $ 1,000,000 $ 1,000,000 $ 300,000      
Stock Issued During Period, Shares, New Issues       500,000 1,000,000 1,500,000      
Shares Issued, Price Per Share       $ 2.00 $ 1.00 $ 0.20      
Payments of Stock Issuance Costs       $ 70,000 $ 70,000 $ 21,000      
Placement Agent Fee Percentage       7.00% 7.00% 7.00%      
Parent Company [Member] | HUANG Jian Cong [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     45.00%            
Parent Company [Member] | WANG Ming Jie [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     20.00%            
Parent Company [Member] | WANG Guo Lin [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     20.00%            
Parent Company [Member] | WANG Jian Di [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     10.00%            
Parent Company [Member] | WANG Yang Ming [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     5.00%            
Parent Company [Member] | ZK International [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     100.00%            
Parent Company [Member] | ZK Pipe [Member]                  
Due from Related Parties               $ 5,581,999  
Holding One [Member] | HUANG Jian Cong [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   45.00%           31.00%  
Holding One [Member] | WANG Ming Jie [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   20.00%           13.80%  
Holding One [Member] | WANG Guo Lin [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   20.00%           13.80%  
Holding One [Member] | WANG Jian Di [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   10.00%           6.90%  
Holding One [Member] | WANG Yang Ming [Member]                  
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   5.00%           3.40%