Note 8 - Preferred Stock (Details Textual)	12 Months Ended
	Sep. 30, 2025 $ / shares shares	Sep. 30, 2024 $ / shares shares	Oct. 12, 2017 shares
Preferred Stock, Shares Authorized (in shares) | shares	20,000,000	20,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Series A Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares) | shares	1,200,000	1,200,000	1,200,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred Stock, Liquidation Preference Per Share | $ / shares	$ 35
Preferred Stock, Convertible, Conversion Ratio	10
Preferred Stock, Convertible, Convertibility, Period After Date of Issuance (Day)	540 days
Preferred Stock, Shares Issued | shares	0