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v3.21.1

Note 2 - Cash, Cash Equivalent, and Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, 2020 |
|  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ | 149,015 |  |  | $ | — |  |  | $ | — |  |  | $ | 149,015 |
Money Market Funds |  | 1 |  |  |  | 20,488,030 |  |  |  | — |  |  |  | — |  |  | $ | 20,488,030 |
Subtotal |  |  |  |  |  | 20,637,045 |  |  |  | — |  |  |  | — |  |  |  | 20,637,045 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4) |  | 2 |  |  |  | 8,473,461 |  |  |  | 22,473 |  |  |  | (6,463 | ) |  | $ | 8,457,451 |
Total |  |  |  |  | $ | 29,110,506 |  |  | $ | 22,473 |  |  | $ | (6,463 | ) |  | $ | 29,094,496 |
|  | December 31, 2019 |
|  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ | 1,010,510 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,010,510 |
Money Market Funds |  | 1 |  |  |  | 3,813,034 |  |  |  | — |  |  |  | — |  |  |  | 3,813,034 |
Subtotal |  |  |  |  |  | 4,823,544 |  |  |  | — |  |  |  | — |  |  |  | 4,823,544 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4) |  | 2 |  |  |  | 29,387,053 |  |  |  | 5,898 |  |  |  | (17,991 | ) |  | $ | 29,399,146 |
Long-Term Investment Securities (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4) |  | 2 |  |  |  | 1,528,190 |  |  |  | 16,554 |  |  |  | — |  |  |  | 1,511,636 |
Total |  |  |  |  | $ | 35,738,787 |  |  | $ | 22,452 |  |  | $ | (17,991 | ) |  | $ | 35,734,326 |

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