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Note 14 - Purchases of Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
Inventory |  | $ | 25,000 |
Machinery and equipment |  |  | 350,000 |
Intellectual property |  |  | 425,000 |
Net tangible assets acquired |  | $ | 800,000 |

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