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Note 6 - Investment in and Transactions with Equity Investees (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 | Apr. 29, 2020 | Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Apr. 23, 2020 | Jun. 30, 2014
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  | $ 10,000 |  | $ 10,000 | $ 10,000 |  |  |  |
Share Price (in dollars per share) |  |  |  |  | $ 0.83 |  | $ 0.83 |  |  |  |  |
Income (Loss) from Equity Method Investments, Total |  |  |  |  |  |  | $ 49,099 |  |  |  |  |
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 |  | $ 373,000 | 549,000 | $ 1,200,000 | 1,100,000 |  |  |  |  |
Sale Price in Cash [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  | 100,000 | $ 100,000 |  |  |  |  |  |  |  |  |
Sale Price in Share [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  | $ 170,260 |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.59 |
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 |  |  |  |  | 0 |  | 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 |  |  |  | 0 | $ 0 | 0 | $ 49,099 |  |  |  |  |
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% |  |

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