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Note 7 - Patents | 3 Months Ended
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Mar. 31, 2021
Notes to Financial Statements |
Goodwill and Intangible Assets Disclosure [Text Block] | NOTE 7 — PATENTS
|  | March 31, 2021 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | (1,059,966 | ) |  | $ | 317,897 |
Total |  | $ | 1,377,863 |  |  | $ | (1,059,966 | ) |  | $ | 317,897 |
|  | December 31, 2020 |
|  | Cost |  |  | Accumulated Amortization |  |  | Net |
Patents-foundation intellectual property |  | $ | 1,377,863 |  |  | $ | (1,048,614 | ) |  | $ | 329,249 |
Total |  | $ | 1,377,863 |  |  | $ | (1,048,614 | ) |  | $ | 329,249 |
Patents are amortized utilizing the straight-line method over estimated useful lives ranging from 3 to 20 years. Amortization expense was approximately $11,000 and $13,000 for the three months ended March 31, 2021 and March 31, 2020, respectively.

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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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