Note 10 - Common Stock Options (Tables)

12 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Years Ended September 30
	2024			2023
Expected volatility		32.07	%		N/A
Expected dividends		2.84	%		N/A
Expected exercise term (years)		7			N/A
Risk-free interest rate		4.95	%		N/A

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Terms (years)		Aggregate Intrinsic Value1
Options outstanding, September 30, 2022		34,500		$	18.69		5.7	$	121,278
Options exercised		(12,500	)		16.00
Options outstanding, September 30, 2023		22,000		$	20.23		5.6	$	18,388
Options granted		10,000			16.62
Options forfeited		(4,000	)		19.90
Options outstanding, September 30, 2024		28,000		$	18.98		5.8	$	127,988
Vested and exercisable at September 30, 2024		28,000		$	18.98		5.8	$	127,988

	Years Ended September 30
	2024		2023
Weighted-average grant date option fair value	$	5.15	$	—
Stock-based compensation		51,500		21,560
Intrinsic value of options exercised		—		46,921
Proceeds from exercise of stock options		—		200,000