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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 |  |  |  |  |  |  |  |

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