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Note 12 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2019
Dec. 31, 2018
Jan. 31, 2017
Nov. 30, 2016
Sep. 30, 2019
Sep. 30, 2018
Nov. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2014
Director of Clinical Affairs [Member]                      
Royalty Expense         $ 92,831 $ 77,907   $ 291,024 $ 284,437    
Professional Fees         39,000 39,000   117,000 146,751    
Accounts Payable, Related Parties   $ 364,000     416,000     416,000   $ 364,000  
Milestone China [Member]                      
Financing Receivable, after Allowance for Credit Loss, Total   2,800,000               2,800,000  
Account Receivables, Related Party, Monthly Payment             $ 200,000        
Accounts Receivable, Related Party, Balloon Payment to be Paid   1,425,000                  
Inventory Adjustments, Total         1,250,000     1,250,000      
Contract with Customer, Asset, Allowance for Credit Loss, Recovery         151,000            
Equity Method Investment, Ownership Percentage                     40.00%
United Systems [Member]                      
Capitalized Contract Cost, Net, Total   686,365               686,365  
Wand Dental Inc [Member]                      
Deferred Revenue, Current, Total   342,540     342,540     342,540   342,540  
Chief Executive Officer [Member]                      
Deferred Compensation Arrangement with Individual, Recorded Liability   387,000     222,000     222,000   387,000  
Chief Financial Officer [Member]                      
Deferred Compensation Arrangement with Individual, Recorded Liability   20,000     20,000     20,000   20,000  
Director [Member]                      
Deferred Compensation Arrangement with Individual, Recorded Liability   280,000     455,000     455,000   280,000  
Manufacturing Agreement for Handpieces [Member]                      
Related Party Transaction, Purchases from Related Party         549,000 361,727   1,100,000 900,000    
Due to Related Parties, Total   $ 1,100,000     1,100,000     1,100,000   1,100,000  
Consulting Services [Member]                      
Consulting Services Agreement, Term       3 years              
Related Party Transaction, Expenses from Transactions with Related Party         25,000 25,000   75,000 75,000    
Consulting Services [Member] | United Systems [Member]                      
Stock Issued During Period, Shares, Issued for Services 285,714                    
Shares Issued, Price Per Share $ 0.35                    
Stock Issued During Period, Value, Issued for Services $ 100,000                    
Distributor Agreement to Milestone China [Member] | United Systems [Member]                      
Revenue from Related Parties                   $ 750,000  
Consultant [Member] | Innovest S.p.A. [Member]                      
Consulting Services Agreement, Term     1 year                
Related Party Transaction, Expenses from Transactions with Related Party         $ 20,000 $ 20,000   $ 60,000 $ 60,000    
Consulting Services Agreement, Renewal Term     1 year