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Note 6 - Investment in and Transactions With Equity Investees (Details Textual) ¥ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 08, 2021 USD ($) | Oct. 08, 2021 CNY (¥) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2014 USD ($)
Income (Loss) from Equity Method Investments |  |  | $ 0 | $ 1,301 |  |  |
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 |  |
Revenue from Related Parties |  |  | 370,000 | 506,400 |  |  |
Contract with Customer, Liability, Total |  |  |  |  |  | $ 89,000 |
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  |  | 407,000 |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 0 | $ 1,301 |  |  |
Milestone China [Member] | Accounts Receivable from Related Parties [Member] |  |  |  |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss, Total |  |  | 270,000 |  |  |  |
Equity Method Investment, Deferred Intercompany Profit (Loss) |  |  | $ 0 |  |  | $ 0 |
Milestone Beijing [Member] | Milestone China [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 75.00%
Anhui [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 28.40% |
Anhui [Member] | Milestone China [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 28.40% | 28.40% |  |  |  |  |
Proceeds from Sale of Equity Method Investments | $ 440,351 | ¥ 2,840 |  |  |  |  |

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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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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130533-203044 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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