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Note 6 - Investment in and Transactions with Unconsolidated Subsidiaries (Details Textual) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Nov. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 10,000 |  | $ 10,000 |  |  | $ 10,000
Income (Loss) from Equity Method Investments, Total |  |  | (9,564) | $ 36,783 |  |
Milestone China [Member] |  |  |  |  |  |
Equity Method Investments |  | $ 1,000,000 | 0 |  |  |
Long-term Purchase Commitment, Minimum Quantity Required |  | 772 |  |  |  |
Equity Method Investment, Ownership Percentage |  | 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 |  |  |  |  | 1,250,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  | 1,250,000 |  |  |
Contract with Customer, Liability, Total | 100,000 |  | 50,000 |  |  | 100,000
Capitalized Contract Cost, Net, Total | 50,000 |  | 24,602 |  |  | $ 50,000
Equity Method Investment, Deferred Intercompany Profit (Loss), Percentage |  |  |  |  |  | 40.00%
Income (Loss) from Equity Method Investments, Total |  |  | 9,564 | $ 36,783 |  |
Cost-method Investments, Realized Losses |  |  | 3,984,177 |  |  | $ 3,380,388
Milestone China [Member] | Accounts Receivable from Related Parties [Member] |  |  |  |  |  |
Equity Method Investment, Deferred Intercompany Profit (Loss) | $ 421,800 |  | $ 431,364 |  |  | $ 421,800

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