| Note 5 - Insurance Premium Financing | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
| Jun. 30, 2023 | Sep. 30, 2022 | |||
| Insurance Premium Financing [Member] | ||||
| Notes to Financial Statements | ||||
| Short-Term Debt [Text Block] | 5. INSURANCE PREMIUM FINANCING 
 In July 2022, the Company entered into a finance agreement with First Insurance Funding in order to fund a portion of its insurance policies. The amount financed was approximately $354,000 and incurred interest at a rate of 2.99%. The Company made monthly payments of approximately $35,000 through April 2023. The outstanding balance as of June 30, 2023 and September 30, 2022 was approximately $0 and $248,000, respectively. As of June 30, 2023, the Company had not entered into a new finance agreement with First Insurance Funding, or any other similar provider. | 
 
 In July 2022, the Company entered into a finance agreement with First Insurance Funding in order to fund a portion of its insurance policies. The amount financed is approximately $354,000 and incurs interest at a rate of 2.99%. The Company is required to make monthly payments of approximately $35,000 through April 2023. The outstanding balance as of September 30, 2022 was approximately $248,000. | 
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- References No definition available. 
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- Definition The entire disclosure for short-term debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Details 
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