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Note 6 - Investment in and Transactions with Unconsolidated Subsidiaries (Details Textual) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Nov. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 10,000 |  | $ 10,000 |  |  | $ 10,000 | $ 10,000 |  | $ 10,000
Income (Loss) from Equity Method Investments, Total |  |  | 58,664 | $ 78,591 |  | 49,100 |  | $ 115,374 |
Milestone China [Member] |  |  |  |  |  |  |  |  |
Equity Method Investments | 0 | $ 1,000,000 | 0 |  |  | 0 | 0 |  | 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 |  | 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 |  | 1,800,000
Capitalized Contract Before Reserve Adjustment | 1,250,000 |  |  |  |  |  | 1,250,000 |  | 1,250,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  | 1,250,000 |  |  | 1,250,000 |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  | 50,000 | 0 |  | $ 100,000 |  | 0 |
Equity Method Investment, Deferred Intercompany Profit (Loss), Percentage |  |  |  |  |  | 40.00% |  |  |
Income (Loss) from Equity Method Investments, Total |  |  | 58,664 | $ 78,591 |  | $ 49,100 |  | $ 115,374 |
Cost-method Investments, Realized Losses |  |  |  |  |  | 4,223,449 |  |  | 3,380,388
Milestone China [Member] | Accounts Receivable from Related Parties [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Deferred Intercompany Profit (Loss) | $ 421,800 |  | $ 372,200 |  |  | $ 372,200 | $ 421,800 |  | $ 421,800

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