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Note 7 - Patents | 6 Months Ended
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Jun. 30, 2019
Notes to Financial Statements |
Goodwill and Intangible Assets Disclosure [Text Block] | NOTE 7 — PATENTS
|  | June 30, 2019 |
|  | Cost |  |  | Impairment |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | - |  |  | $ | (969,096 | ) |  | $ | 408,767 |
Total |  | $ | 1,377,863 |  |  | $ | - |  |  | $ | (969,096 | ) |  | $ | 408,767 |
|  | 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 approximately $13,000 and $26,500 for the three and six months ended June 30, 2019, respectively. Amortization expense was approximately $232,000 and $469,000 for the three and six months ended June 30, 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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