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Note 6 - Investment in and Transactions with Unconsolidated Subsidiaries - Summarized Financial Information (Unaudited) of Milestone China (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Total assets: | $ 18,941,168 |  | $ 18,941,168 |  | $ 15,191,133
Current liabilities | 23,276,964 |  | 23,276,964 |  | 17,696,033
Stockholders' deficit | (4,335,796) |  | (4,335,796) |  | (2,504,900)
Total liabilities and stockholders’ deficit | 18,941,168 |  | 18,941,168 |  | 15,191,133
Net sales | 1,149,474 | $ 1,328,079 | 1,753,802 | $ 2,085,034 |
Cost of goods sold | 324,300 | 650,840 | 559,400 | 1,098,452 |
Gross profit | 825,174 | 677,239 | 1,194,402 | 986,582 |
Other expenses | (1,423,353) | (1,119,440) | (3,302,057) | (2,371,652) |
Net loss | (598,179) | $ (442,201) | (2,107,655) | $ (1,385,070) |
Milestone China [Member] |  |  |  |  |
Current assets | 13,966,781 |  | 13,966,781 |  | 10,587,648
Non-current assets | $ 4,974,387 |  | $ 4,974,387 |  | $ 4,603,485

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