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For investments in debt and equity securities accounted for at cost, the excess of the carrying amount over net sale proceeds of investments disposed of during the period and any losses recognized thereon for impairments of other than a temporary nature.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Note 6 - Investment in and Transactions with Unconsolidated Subsidiaries (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		5 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2014
Accounts Receivable, Allowance for Credit Loss, Ending Balance		$ 10,000			$ 10,000
Income (Loss) from Equity Method Investments, Total			$ 9,564
Milestone China [Member]
Equity Method Investments							$ 1,000,000
Equity Method Investment, Ownership Percentage		28.40%					40.00%
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
Contract With Customer Liability Before Reserve Adjustment	1,800,000					1,800,000
Capitalized Contract Before Reserve Adjustment	1,250,000	$ 1.25				1,250,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 1,250,000					$ 1,250,000
Revenue from Related Parties		$ 0	50,000
Equity Method Investment, Deferred Intercompany Profit (Loss), Percentage						40.00%
Income (Loss) from Equity Method Investments, Total			$ 9,564
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
Milestone Beijing [Member] \| Milestone China [Member]
Equity Method Investment, Ownership Percentage							75.00%