Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Investments (Details Textual)

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Note 3 - Investments (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) $ 0 $ 0
Investments 2,976,649 4,933,550 [1]
Payments to Acquire Debt Securities, Available-for-Sale   0
US Treasury Bill Securities [Member]    
Investments $ 3,000,000.0 $ 4,900,000
[1] Derived from the Company’s audited consolidated financial statements.