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Note 6 - Investment in and Transactions with Equity Investees (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 29, 2020
Jul. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Jun. 30, 2014
Accounts Receivable, Allowance for Credit Loss, Ending Balance     $ 10,000   $ 10,000   $ 10,000      
Share Price (in dollars per share)       $ 0.36   $ 0.36        
Income (Loss) from Equity Method Investments, Total     $ 58,664 $ 49,100        
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       $ 725,000 505,000        
Sale Price in Cash [Member]                    
Related Party Transaction, Purchases from Related Party 100,000                  
Sale Price in Share [Member]                    
Related Party Transaction, Purchases from Related Party $ 170,260                  
Share Price (in dollars per share) $ 1.59                  
Forecast [Member] | Sale Price in Cash [Member]                    
Related Party Transaction, Purchases from Related Party   $ 100,000                
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       50,000   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       $ 9,564   $ 58,664        
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%