Note 3 - Equity - Preferred Stock Redemption (Details) - USD ($)	3 Months Ended			6 Months Ended	147 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2023	Mar. 31, 2024	Aug. 29, 2023
Preferred stock redemption (in shares)	140,186				140,186
Price paid per share (in dollars per share)	$ 10.7				$ 10.7	$ 10.7
Dollars Expended by Period under the Preferred Redemption	$ 1,499,990				$ 1,499,990
Preferred Stock, Redemption, Aggerate Purchase Price						$ 8,964,214
Series B and Series B-1 Preferred Stock [Member]
Preferred stock redemption (in shares)		0	0
Price paid per share (in dollars per share)		$ 10.7	$ 10.7	$ 10.7
Dollars Expended by Period under the Preferred Redemption		$ 0	$ 0	$ 0
Preferred Stock, Redemption, Aggerate Purchase Price		6,691,513		$ 6,691,513
Series B Preferred Stock [Member]
Preferred stock redemption (in shares)				0
Price paid per share (in dollars per share)	$ 10.7				$ 10.7
Dollars Expended by Period under the Preferred Redemption		0		$ 0
Preferred Stock, Redemption, Aggerate Purchase Price	$ 6,691,513	$ 6,691,513		$ 6,691,513	$ 6,691,513