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Note 2 - Cash, Cash Equivalents, and Investments - Major Security Type (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Cash and cash equivalent, fair value |  | $ 6,515,028 | $ 5,794,272
Cash, adjusted cost |  | 25,775 | 26,782
Money Market Funds, adjusted cost |  | 6,489,253 | 5,767,490
Cash and cash equivalents |  | 6,515,028 | 5,794,272
Corporate Bonds, gross unrealized holding gains |  | 0 | 0
Corporate Bonds, gross unrealized holding losses |  | (185) | (47,208)
Short-term investment securities |  | 748,290 | 6,847,270
Total, fair value |  | 7,263,133 | 12,594,334
Total, adjusted cost |  | 7,263,318 | 12,641,542
Cash [Member] |  |  |
Cash and cash equivalent, fair value |  | 25,775 | 26,782
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalent, fair value |  | 6,489,253 | 5,767,490
Short-term Corporate Bonds [Member] |  |  |
Short-term investment securities | [1],[2] | 748,290 | 6,847,270
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Corporate Bonds, fair value | [1],[2] | 748,105 | 6,800,062
Corporate Bonds, gross unrealized holding gains | [1],[2] | 0 | 0
Corporate Bonds, gross unrealized holding losses | [1],[2] | $ (185) | $ (47,208)
[1] | For the years ended December 31, 2023 and 2022, the Company received discounts of $39,012 and $6,280 to purchase held-to-maturity investment securities, respectively.
[2] | Short-term investment securities will mature within 12 months or less, from the applicable reporting date.

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