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Note 12 - Related Party Transactions (Details Textual) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | Jan. 31, 2017 | Aug. 31, 2016 | Jun. 30, 2014 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Nov. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Director of Clinical Affairs [Member] |  |  |  |  |  |  |  |  |
Royalty Expense |  |  |  |  |  | $ 91,490 | $ 85,769 |  |
Professional Fees |  |  |  |  |  | 39,000 | 68,751 |  |
Accounts Payable, Related Parties |  | $ 364,000 |  |  |  | 309,000 |  |  | $ 364,000
Milestone China [Member] |  |  |  |  |  |  |  |  |
Capitalized Contract Cost, Net, Total |  | 50,000 |  |  |  | 24,602 |  |  | 50,000
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 |  |  |  |  |  |  |
Proceeds from Collection of Finance Receivables |  |  |  |  |  | 950,000 |  |  |
Inventory Adjustments, Total |  | 1,250,000 |  |  |  |  |  |  | 1,250,000
Equity Method Investments |  |  |  |  | $ 1,000,000 | 0 |  |  |
Long-term Purchase Commitment, Minimum Quantity Required |  |  |  |  | 772 |  |  |  |
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
Manufacturing Agreement for Handpieces [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  |  |  |  | 338,000 | 351,000 |  |
Due to Related Parties, Total |  | $ 1,000,000 |  |  |  | 1,200,000 |  |  | 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 |  |
Consulting Services [Member] | United Systems [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services | shares | 285,714 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 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 |  |

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