Note 9- Income Taxes (Details Textual) - USD ($)	12 Months Ended
Note 9- Income Taxes (Details Textual) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,976,000	$ 483,000
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 48,200,000	42,700,000
Domestic Tax Authority [Member] \| Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	679,000	626,000
Domestic Tax Authority [Member] \| Expire In 2028 [Member]
Operating Loss Carryforwards	21,750,000
Domestic Tax Authority [Member] \| Indefinite Life Carryforwards [Member]
Operating Loss Carryforwards	26,444,000	20,945,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	44,570,000	40,367,000
State and Local Jurisdiction [Member] \| Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 425,000	$ 406,000