Stock Option - Activity (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Options
Granted	0	0
2012 Employee Stock Option Plan
Options
Outstanding, beginning of year	523,080	214,080	214,080
Granted	37,500	0
Exercised	(5,200)	(5,000)
Outstanding, end of period	555,380	209,080	523,080
Exercisable, end of period	183,852	97,976
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 18.59	$ 9.59	$ 9.59
Granted (per share)	26.94
Exercised (per share)	8.64	3.16
Weighted average exercise price, end of period	19.25	9.74	$ 18.59
Exercisable, end of period, weighted average exercise price	15.26	$ 8.48
Additional disclosures
Weighted average fair value at grant date of options granted	$ 13.36
Total intrinsic value of options exercised	$ 107,000	$ 94,000
Total intrinsic value of options outstanding	5,684,000	2,467,000
Total intrinsic value of options exercisable	$ 2,586,000	$ 1,280,000
2012 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	20,400	12,000	12,000
Granted	0
Outstanding, end of period	20,400	12,000	20,400
Exercisable, end of period	11,280	6,240
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 14.39	$ 6.55	$ 6.55
Exercised (per share)	0
Weighted average exercise price, end of period	14.39	6.55	$ 14.39
Exercisable, end of period, weighted average exercise price	$ 8.92	$ 6.04
Additional disclosures
Total intrinsic value of options outstanding	$ 300,000	$ 180,000
Total intrinsic value of options exercisable	$ 227,000	$ 97,000
2018 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	89,000	70,100	70,100
Granted	0
Exercised	(6,300)	0
Outstanding, end of period	82,700	70,100	89,000
Exercisable, end of period	38,740	29,960
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 14.91	$ 11.93	$ 11.93
Exercised (per share)	14.41
Weighted average exercise price, end of period	14.95	11.93	$ 14.91
Exercisable, end of period, weighted average exercise price	$ 12.75	$ 11.68
Additional disclosures
Total intrinsic value of options exercised	$ 99,000
Total intrinsic value of options outstanding	1,169,000	$ 674,000
Total intrinsic value of options exercisable	$ 633,000	$ 295,000
2020 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	26,900	10,000	10,000
Granted	25,000	0
Outstanding, end of period	51,900	10,000	26,900
Exercisable, end of period	14,380	4,000
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 18.64	$ 11.40	$ 11.40
Granted (per share)	26.94
Weighted average exercise price, end of period	22.64	11.40	$ 18.64
Exercisable, end of period, weighted average exercise price	19.51	$ 11.40
Additional disclosures
Weighted average fair value at grant date of options granted	$ 13.36
Total intrinsic value of options outstanding	$ 334,000	$ 101,000
Total intrinsic value of options exercisable	$ 138,000	$ 41,000