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Note 6 - Investment in and Transactions With Equity Investees (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Apr. 29, 2020 | Jul. 31, 2020 | May 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2020 | Apr. 23, 2020 | Jun. 30, 2014
Revenue from Related Parties |  |  |  |  | $ 506,400 | $ 0 |  |  |  |
Contract with Customer, Liability, Total |  |  |  |  | 178,000 |  |  |  |  |
Income (Loss) from Equity Method Investments, Total |  |  |  |  | 1,301 |  |  |  |  |
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 | $ 370,260 |  |  | 385,000 | $ 544,000 |  |  |  |
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%
Financing Receivable, after Allowance for Credit Loss, Total |  |  |  |  |  |  | $ 2,800,000 |  |  |
Proceeds from Collection of Finance Receivables |  |  |  |  |  |  | $ 950,000 |  |  |
Due from Related Parties, Total |  |  |  |  |  |  |  | $ 1,400,000 |  |
Income (Loss) from Equity Method Investments, Total |  |  |  |  | 1,301 |  |  |  |  |
Milestone China [Member] | Accounts Receivable from Related Parties [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Deferred Intercompany Profit (Loss) |  |  |  |  | $ 241,000 |  |  | 243,000 |  |
Milestone Beijing [Member] | Milestone China [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 75.00%
Anhui [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  | 0 |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 28.40% |  |  |  |  |
Equity Method Investments, Accumulated Loss |  |  |  |  |  |  |  | $ 5,900,000 |  |

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- Definition The aggregate amount of deferred intercompany profits and losses on transactions between the Entity and unconsolidated subsidiaries (including certain corporate joint ventures, and noncontrolled corporations), accounted for under the equity method of accounting,as of the balance sheet date. + References No definition available. + Details
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