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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Total assets: | $ 18,942,323 |  | $ 18,942,323 |  | $ 15,191,493
Current liabilities | 23,477,542 |  | 23,477,542 |  | 17,696,033
Stockholders' equity (deficit) | (4,535,219) |  | (4,535,219) |  | (2,504,900)
Total liabilities and stockholders’ deficit | 18,942,323 |  | 18,942,323 |  | 15,191,133
Net sales | 678,140 | $ 1,710,473 | 2,431,942 | $ 3,795,507 |
Cost of goods sold | 423,948 | 789,957 | 983,348 | 1,888,409 |
Gross profit | 254,192 | 920,516 | 1,448,594 | 1,907,098 |
Other expenses | (598,324) | (1,371,085) | (3,900,382) | (3,742,737) |
Net loss | (344,132) | $ (450,569) | (2,451,788) | $ (1,835,639) |
Milestone China [Member] |  |  |  |  |
Current assets | 14,186,280 |  | 14,186,280 |  | 10,587,648
Non-current assets | $ 4,756,043 |  | $ 4,756,043 |  | $ 4,603,845

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