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Note 5 - Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Certificates of Deposit $ 0 $ 125,000
Money market funds 178,770 1,031,361
U.S. Treasury Bills (original 3-month maturity) 7,044,946 6,746,727
Total cash and cash equivalents 8,405,371 8,243,122
Demand Deposits [Member]    
Demand deposits $ 1,181,655 $ 340,034