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Note 12 - Related Party Transactions (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2019 | Dec. 31, 2018 | Jan. 31, 2017 | Aug. 31, 2016 | Jun. 30, 2019 | Jun. 30, 2018 | Nov. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Jun. 30, 2014
Director of Clinical Affairs [Member] |  |  |  |  |  |  |  |  |  |  |
Royalty Expense |  |  |  |  | $ 108,000 | $ 116,956 |  | $ 199,000 | $ 202,481 |  |
Professional Fees |  |  |  |  | 39,000 | 39,000 |  | 78,000 | 107,751 |  |
Accounts Payable, Related Parties |  | $ 364,000 |  |  | 410,000 |  |  | 410,000 |  | $ 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 |  |  |
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 |
Manufacturing Agreement for Handpieces [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  |  |  | 167,000 | 222,000 |  | 505,600 | 574,000 |  |
Due to Related Parties, Total |  | $ 1,000,000 |  |  | 1,000,000 |  |  | 1,000,000 |  | 1,000,000 |
Consulting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Consulting Services Agreement, Term |  |  |  | 3 years |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  | 25,000 | 25,000 |  | 50,000 | 50,000 |  |
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 |  | $ 40,000 | $ 40,000 |  |
Consulting Services Agreement, Renewal Term |  |  | 1 year |  |  |  |  |  |  |  |

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