Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Investment in and Transactions with Equity Investees (Details Textual)

v3.20.2
Note 6 - Investment in and Transactions with Equity Investees (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2020
Apr. 29, 2020
Jul. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Apr. 23, 2020
Jun. 30, 2014
Accounts Receivable, Allowance for Credit Loss, Ending Balance         $ 10,000   $ 10,000 $ 10,000        
Share Price (in dollars per share)         $ 0.83   $ 0.83          
Income (Loss) from Equity Method Investments, Total       $ 49,099          
Acquisition of Advanced Cosmetic Systems [Member]                        
Business Acquisition, Percentage of Voting Interests Acquired 50.00%                      
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                      
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total 100.00%                      
Manufacturing Agreement for Handpieces [Member]                        
Related Party Transaction, Purchases from Related Party   $ 370,260   $ 373,000 549,000 $ 1,200,000 1,100,000          
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]                        
Equity Method Investments                       $ 1,000,000
Equity Method Investment, Ownership Percentage       40.00%   40.00%           40.00%
Financing Receivable, after Allowance for Credit Loss, Total                 $ 2,800,000      
Proceeds from Collection of Finance Receivables                 950,000      
Accounts Receivable, Allowance for Credit Loss, Ending Balance                 $ 1,250,000      
Revenue from Related Parties       $ 0 0 $ 0 0          
Contract with Customer, Liability, Revenue Recognized         0   100,000          
Due from Related Parties, Total       1,400,000   1,400,000            
Costs and Expenses, Related Party           370,260            
Equity Method Investment, Deferred Intercompany Profit (Loss), Percentage                 40.00%      
Income (Loss) from Equity Method Investments, Total       0 $ 0 0 $ 49,099          
Cost-method Investments, Realized Losses               4,300,000        
Milestone China [Member] | Accounts Receivable from Related Parties [Member]                        
Equity Method Investment, Deferred Intercompany Profit (Loss)       $ 340,476   $ 340,476   $ 340,476        
Milestone Beijing [Member] | Milestone China [Member]                        
Equity Method Investment, Ownership Percentage                       75.00%
Anhui [Member] | Forecast [Member]                        
Equity Method Investment, Ownership Percentage                   28.40%