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Note 7 - Patents | 3 Months Ended
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Mar. 31, 2019
Notes to Financial Statements |
Goodwill and Intangible Assets Disclosure [Text Block] | NOTE 7 — PATENTS
|  | March 31, 2019 |
|  | Cost |  |  | Impairment |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | - |  |  | $ | (955,842 | ) |  | $ | 422,021 |
Total |  | $ | 1,377,863 |  |  | $ | - |  |  |  | (955,842 | ) |  | $ | 422,021 |
|  | December 31, 2018 |
|  | Cost |  |  | Impairment |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | - |  |  | $ | (942,590 | ) |  | $ | 435,273 |
Epidural-Apad acquired patents |  |  | 2,639,647 |  |  |  | (1,539,794 | ) |  |  | (1,099,853 | ) |  |  | - |
Total |  | $ | 4,017,510 |  |  | $ | (1,539,794 | ) |  | $ | (2,042,443 | ) |  | $ | 435,273 |
Patents are amortized utilizing the straight-line method over estimated useful lives ranging from 3 to 20 years. Amortization expense was $13,252 and $237,366 for the three months ended March 31, 2019 and 2018, respectively. During 2018, the Company determined that the APAD Patents purchased in 2017 will not be further developed or commercialized before their estimated useful life expires. As such, Management determined that these assets were impaired and a charge of approximately $1.5 million was recorded.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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