Note 5 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Available-for-Sale Debt Securities	$ 29,922,523
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Available-for-Sale Debt Securities	18,032,943
US Treasury Securities [Member]
Available-for-Sale Debt Securities	3,938,520
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Total assets measured at fair value		$ 7,559,336	$ 7,792,846
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Available-for-Sale Debt Securities		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Available-for-Sale Debt Securities		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Debt Securities [Member]
Available-for-Sale Debt Securities		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]
Cash and Cash Equivalents		7,559,336	7,792,846
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Total assets measured at fair value		29,922,523	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Available-for-Sale Debt Securities		18,032,943
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Available-for-Sale Debt Securities		7,951,060
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Debt Securities [Member]
Available-for-Sale Debt Securities		3,938,520
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]
Cash and Cash Equivalents		$ 0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Total assets measured at fair value	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Available-for-Sale Debt Securities	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Available-for-Sale Debt Securities	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Debt Securities [Member]
Available-for-Sale Debt Securities	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]
Cash and Cash Equivalents	$ 0		$ 0