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Note 6 - Investment in and Transactions With Equity Investees (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2020
Apr. 29, 2020
Jul. 31, 2020
May 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2018
Jun. 30, 2021
Mar. 27, 2021
Dec. 31, 2020
Apr. 23, 2020
Jun. 30, 2014
Equity Method Investment, Deferred Intercompany Profit (Loss)         $ 407,000   $ 407,000              
Income (Loss) from Equity Method Investments, Total         (69,905) $ 0 (164,461) $ 0            
Acquisition of Advanced Cosmetic Systems [Member]                            
Business Acquisition, Percentage of Voting Interests Acquired       50.00%             100.00%      
Business Combination, Consideration Transferred, Total       $ 900,000                    
Business Combination, Percentage of Ownership Interest that Seller of Ownership Interest May Repurchase Within One Year of Sale Date       50.00%                    
Business Combination, Price at Which the Additional Ownership Interest Acquired May Repurchased Within One Year of Sale Date       $ 900,000                    
Manufacturing Agreement for Handpieces [Member]                            
Related Party Transaction, Purchases from Related Party $ 370,260 $ 370,260     417,000 373,000 1,300,000 1,200,000            
Sale Price in Cash [Member]                            
Related Party Transaction, Purchases from Related Party 100,000   $ 100,000                      
Sale Price in Share [Member]                            
Related Party Transaction, Purchases from Related Party $ 170,260                          
Share Price (in dollars per share)                         $ 1.59  
Milestone China [Member]                            
Revenue from Related Parties         360,000   1,400,000 $ 0            
Contract with Customer, Liability, Total         253,000   253,000              
Contract with Customer, Asset, Allowance for Credit Loss, Ending Balance                   $ 269,973        
Milestone China [Member]                            
Equity Method Investments                           $ 1,000,000
Equity Method Investment, Ownership Percentage                           40.00%
Financing Receivable, after Allowance for Credit Loss, Total                 $ 2,800,000          
Proceeds from Collection of Finance Receivables                 $ 950,000          
Due from Related Parties, Total                       $ 1,400,000    
Income (Loss) from Equity Method Investments, Total         $ 70,000 $ 0 $ 164,000              
Milestone China [Member] | Accounts Receivable from Related Parties [Member]                            
Equity Method Investment, Deferred Intercompany Profit (Loss)                       243,000    
Milestone Beijing [Member] | Milestone China [Member]                            
Equity Method Investment, Ownership Percentage                           75.00%
Anhui [Member]                            
Equity Method Investments                       0    
Equity Method Investment, Ownership Percentage         28.40%   28.40%              
Equity Method Investments, Accumulated Loss                       $ 5,900,000