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Note 12 - Geographical Sales (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] | Geographical distribution of sales consisted of the following for the years ended December 31, 2018 and 2017:
|  | 2018 |  |  | 2017 |
Geographical Areas |  |  |  |  |  |  |  |
North America |  | $ | 54,126,312 |  |  | $ | 49,765,102 |
Europe |  |  | - |  |  |  | 3,456,045 |
China |  |  | 11,331,108 |  |  |  | 14,598,858 |
Australia |  |  | 11,075,268 |  |  |  | 25,895,686 |
Asia* |  |  | 11,817,196 |  |  |  | 12,281,116 |
Hong Kong |  |  | 2,922 |  |  |  | 471,279 |
Other countries |  |  | 292,398 |  |  |  | 26,046 |
|  | $ | 88,645,204 |  |  | $ | 106,494,132 |
* excluding China and Hong Kong

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