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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Total assets: | $ 17,593,789 | $ 15,191,133
Current liabilities | 21,914,957 | 17,696,033
Stockholders' equity (deficit) | (4,321,168) | (2,504,900)
Total liabilities and stockholders’ deficit | 17,593,789 | 15,191,133
Net sales | 604,328 | 756,956
Cost of goods sold | 235,100 | 447,611
Gross profit | 369,228 | 309,345
Other expenses | (1,878,704) | (1,252,213)
Net loss | (1,509,476) | (942,868)
Milestone China [Member] |  |
Current assets | 12,989,534 | 10,587,648
Non-current assets | $ 4,604,255 | $ 4,603,485

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