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Note 7 - Patents - Summary of Patents (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Patents, cost |  | $ 4,017,510
Patents, impairment |  | (1,539,794)
Patents, accumulated amortization |  | (2,042,443)
Patents, net | $ 422,021 | 435,273
Foundation Intellectual Property Patents [Member] |  |
Patents, cost | 1,377,863 | 1,377,863
Patents, impairment |  |
Patents, accumulated amortization | (955,842) | (942,590)
Patents, net | 422,021 | 435,273
Epidural-Apad Patents [Member] |  |
Patents, cost | 1,377,863 | 2,639,647
Patents, impairment |  | (1,539,794)
Patents, accumulated amortization | (955,842) | (1,099,853)
Patents, net | $ 422,021 |

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