Note 2 - Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) |
Jun. 30, 2023 |
Dec. 31, 2022 |
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---|---|---|---|---|---|---|---|---|
Cash equivalents(1) | [1] | $ 6,133,928 | $ 7,248,946 | |||||
Investments(2) | 2,976,649 | 4,933,550 | [2] | |||||
Total | 9,110,577 | 12,182,496 | ||||||
Fair Value, Inputs, Level 1 [Member] | ||||||||
Cash equivalents(1) | 6,133,928 | [1] | 7,248,946 | |||||
Investments(2) | [2] | 2,976,649 | 4,933,550 | |||||
Total | $ 9,110,577 | $ 12,182,496 | ||||||
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