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Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Product sales, net | $ 1,915,909 | $ 1,805,605 |
Operating Income (Loss) | (818,181) | (2,001,668) |
Depreciation and Amortization | 26,045 | 264,991 |
Income (loss) before taxes and equity in earnings of affiliates | (779,166) | (2,000,704) |
Assets | 7,961,631 | 6,400,968 | $ 6,400,968
Corporate, Non-Segment [Member] |  |  |
Operating Income (Loss) | (818,464) | (1,650,451) |
Depreciation and Amortization | 19,512 | 243,973 |
Income (loss) before taxes and equity in earnings of affiliates | (779,765) | (1,651,572) |
Assets | 2,618,862 | 902,816 |
Dental Segment [Member] |  |  |
Product sales, net | 1,915,509 | 1,769,105 |
Dental Segment [Member] | Operating Segments [Member] |  |  |
Product sales, net | 1,915,509 | 1,769,105 |
Operating Income (Loss) | 491,966 | 357,165 |
Depreciation and Amortization | 3,936 | 4,141 |
Income (loss) before taxes and equity in earnings of affiliates | 492,985 | 359,822 |
Assets | 4,977,176 | 5,169,944 |
Medical Segment [Member] |  |  |
Product sales, net | 400 | 36,500 |
Medical Segment [Member] | Operating Segments [Member] |  |  |
Product sales, net | 400 | 36,500 |
Operating Income (Loss) | (491,683) | (708,382) |
Depreciation and Amortization | 2,597 | 16,877 |
Income (loss) before taxes and equity in earnings of affiliates | (492,386) | (708,954) |
Assets | $ 365,593 | $ 328,208 |

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