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Note 2 - Cash, Cash Equivalents, and Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | June 30, 2021 (Unaudited) |
|  |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ | 820,985 |  |  | $ | — |  |  | $ | — |  |  | $ | 820,985 |
Money Market Funds |  |  | 1 |  |  |  | 13,197,841 |  |  |  | — |  |  |  | — |  |  |  | 13,197,841 |
Subtotal |  |  |  |  |  |  | 14,018,826 |  |  |  | — |  |  |  | — |  |  |  | 14,018,826 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (3) |  |  | 2 |  |  |  | 11,570,334 |  |  |  | — |  |  |  | (11,577 | ) |  |  | 11,581,911 |
Total |  |  |  |  |  | $ | 25,589,160 |  |  | $ | — |  |  | $ | (11,577 | ) |  | $ | 25,600,737 |
|  | December 31, 2020 (Audited) |
|  |  |  |  |  |  |  |  |  | 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 (3) |  |  | 2 |  |  |  | 8,473,461 |  |  |  | 22,473 |  |  |  | (6,463 | ) |  |  | 8,457,451 |
Total |  |  |  |  |  | $ | 29,110,506 |  |  | $ | 22,473 |  |  | $ | (6,463 | ) |  | $ | 29,094,496 |

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