Amount of cost to be recognized for option under share-based payment arrangement.

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Note 9 - Stock Based Compensation (Details Textual) - USD ($)		1 Months Ended			12 Months Ended
	Apr. 19, 2019	Apr. 30, 2025	Apr. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Jan. 08, 2021	Jun. 02, 2015
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount					$ 0
Share-Based Payment Arrangement, Option [Member] \| Board of Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)			5 years
Restricted Stock [Member] \| Board of Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		9,432		2,000		2,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value		$ 8,964		$ 13,760		$ 4,296
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche Four [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)					10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					3 years
Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)					5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					1 year
The 2015 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)								26,112
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Percentage								1.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	45,445
The 2015 Plan [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					1,875
The 2015 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Shares (in shares)								2,223
The 2021 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)							111,112
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Percentage							1.00%
The 2021 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Shares (in shares)							5,556