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Note J - Patents (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
| 2017 |  | 2016
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Patents-foundation intellectual property | 1,377,863 |  | (787,821 | ) | 590,042 |  | 1,377,543 |  | (717,086 | ) | 660,457
Epidural-Apad acquired patents | 2,639,647 |  | (439,941 | ) | 2,199,706 |  | - |  | - |  | -
Total | 4,017,510 |  | (1,227,762 | ) | 2,789,748 |  | 1,377,543 |  | (717,086 | ) | 660,457

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