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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