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Note 8 - Lines of Credit (Details) - Line of Credit [Member] - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 19, 2017
Feb. 16, 2016
Jan. 20, 2016
Sep. 28, 2015
Sep. 21, 2015
Aug. 01, 2015
Jun. 08, 2015
Jan. 22, 2015
Nov. 20, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 17, 2015
Diamond Bar [Member]                                
Note 8 - Lines of Credit (Details) [Line Items]                                
Line of Credit Facility, Maximum Borrowing Capacity     $ 8,000,000 $ 6,000,000   $ 5,000,000 $ 6,000,000             $ 5,000,000    
Line of Credit Facility, Interest Rate at Period End           4.25%       5.25%   5.25%   4.25%   4.00%
Line of Credit Facility, Expiration Date Jun. 01, 2019     Jun. 01, 2017   Sep. 01, 2015 Jul. 31, 2015             Jun. 01, 2015    
Line of Credit Facility, Interest Rate During Period     4.00% 3.75%                        
Line of Credit Facility, Collateral                       The line of credit is secured by all of the assets of Diamond Bar and is guaranteed by Nova LifeStyle.        
Long-term Line of Credit                   $ 4,851,825   $ 4,851,825     $ 4,202,118  
Interest Expense, Debt                   36,696 $ 40,932 92,524 $ 145,857      
Line of Credit Facility, Remaining Borrowing Capacity                   $ 3,148,175   $ 3,148,175        
Line of Credit Facility, Covenant Terms                   The Diamond Bar loan has the following covenants: (i) maintain a minimum tangible net worth of not less than $20 million; (ii) maintain a ratio of debt to tangible net worth not in excess of 2.5 to 1.0; (iii) the pre-tax income must be not less than 1% of total revenue quarterly; and (iv) maintain a current ratio in excess of 1.25 to 1.00.            
Line of Credit Facility, Covenant Compliance                       Diamond Bar was in compliance with the stated covenants.        
Nova Macao [Member]                                
Note 8 - Lines of Credit (Details) [Line Items]                                
Line of Credit Facility, Maximum Borrowing Capacity   $ 6,500,000           $ 6,500,000                
Line of Credit Facility, Interest Rate at Period End               4.25%                
Line of Credit Facility, Expiration Date   Jan. 31, 2017           Jan. 29, 2016                
Line of Credit Facility, Interest Rate During Period   4.00%                            
Line of Credit Facility, Collateral               The loan was secured by assignment of Sinosure (China Export and Credit Insurance Company) credit insurance and was guaranteed by Nova LifeStyle and Diamond Bar.                
Long-term Line of Credit                   $ 0   $ 0     $ 0  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities                   $ 0 $ 0 $ 0 $ 13,828      
Nova Dongguan [Member]                                
Note 8 - Lines of Credit (Details) [Line Items]                                
Debt Instrument, Maturity Date, Description                 February 2017              
Nova Dongguan [Member] | Line of Credit #2 [Member]                                
Note 8 - Lines of Credit (Details) [Line Items]                                
Debt Instrument, Payment Terms         monthly payment of interest and that the interest rate will be adjusted annually