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Note 11 - Geographical Sales (Tables) | 9 Months Ended
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Sep. 30, 2019
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 nine and three months ended September 30, 2019 and 2018:
|  | Nine Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Geographical Areas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North America |  | $ | 12,375,085 |  |  | $ | 40,224,090 |  |  | $ | 4,247,435 |  |  | $ | 13,237,312 |
China |  |  | 11,792,589 |  |  |  | - |  |  |  | 4,958,128 |  |  |  | - |
Australia |  |  | - |  |  |  | 11,075,268 |  |  |  | - |  |  |  | 548,580 |
Asia* |  |  | - |  |  |  | 11,677,878 |  |  |  | - |  |  |  | 2,816,233 |
Other countries |  |  | 410,172 |  |  |  | 182,693 |  |  |  | 117,273 |  |  |  | 145,702 |
|  | $ | 24,577,846 |  |  | $ | 63,159,929 |  |  | $ | 9,322,836 |  |  | $ | 16,747,827 |
* excluding China

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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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