Note 1 - Organization and Summary of Significant Accounting Policies - Summary of Convertible Notes (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Decrease (increase) in fair value of convertible debt	$ (2,583)		$ (1,446,000)	$ 87,380	$ (1,446,000)
Fair Value, Inputs, Level 1 [Member]
Balance	0	$ 0		0
Conversion of convertible notes
Decrease (increase) in fair value of convertible debt	0	0
Balance	0	0		0
Fair Value, Inputs, Level 2 [Member]
Balance	0	0		0
Conversion of convertible notes
Decrease (increase) in fair value of convertible debt	0	0
Balance	0	0		0
Fair Value, Inputs, Level 3 [Member]
Balance	362,021	1,171,308		1,171,308
Conversion of convertible notes	(364,604)	(719,324)
Decrease (increase) in fair value of convertible debt	2,583	(89,963)
Balance	$ 0	$ 362,021		$ 0