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Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Product sales, net | $ 2,257,851 | $ 2,428,498 | $ 4,173,759 | $ 4,234,103 |
Operating Income (Loss) | (1,107,831) | (1,424,687) | (1,926,015) | (3,426,340) |
Depreciation and Amortization | 25,456 | 245,127 | 51,501 | 510,118 |
Income (loss) before taxes and equity in earnings of affiliates | (1,097,744) | (1,424,517) | (1,876,911) | (3,425,207) |
Assets | 6,788,289 |  | 6,788,289 |  | $ 6,400,968
Corporate, Non-Segment [Member] |  |  |  |  |
Operating Income (Loss) | (1,072,647) | (1,301,607) | (1,891,114) | (2,952,043) |
Depreciation and Amortization | 15,507 | 238,546 | 31,445 | 482,519 |
Income (loss) before taxes and equity in earnings of affiliates | (1,060,788) | (1,302,787) | (1,840,553) | (2,954,345) |
Assets | 1,101,541 |  | 1,101,541 |  | 902,816
Dental Segment [Member] | Operating Segments [Member] |  |  |  |  |
Product sales, net | 2,242,751 | 2,388,898 | 4,158,259 | 4,158,003 |
Operating Income (Loss) | 629,474 | 723,084 | 1,121,440 | 1,080,249 |
Depreciation and Amortization | 3,950 | 4,103 | 7,886 | 8,244 |
Income (loss) before taxes and equity in earnings of affiliates | 627,051 | 725,007 | 1,120,035 | 1,084,829 |
Assets | 5,409,961 |  | 5,409,961 |  | 5,169,944
Medical Segment [Member] | Operating Segments [Member] |  |  |  |  |
Product sales, net | 15,100 | 39,600 | 15,500 | 76,100 |
Operating Income (Loss) | (664,658) | (846,164) | (1,156,341) | (1,554,546) |
Depreciation and Amortization | 5,999 | 2,478 | 12,170 | 19,355 |
Income (loss) before taxes and equity in earnings of affiliates | (664,007) | $ (846,737) | (1,156,393) | $ (1,555,691) |
Assets | $ 276,787 |  | $ 276,787 |  | $ 328,208

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