Stock Option - Activity (Details) - USD ($)	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
2012 Employee Stock Option Plan
Options
Outstanding, beginning of year	523,080	214,080	235,680
Granted	37,500	338,000	0
Forfeited/Lapsed			(13,000)
Exercised	(39,000)	(29,000)	(8,600)
Outstanding, end of period	521,580	523,080	214,080
Exercisable, end of period	247,628	176,752	98,176
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 18.59	$ 9.59	$ 9.42
Granted (per share)	26.94	23.17
Forfeited/Lapsed (per share)			6.91
Exercised (per share)	10.44	5.45	9.04
Weighted average exercise price, end of period	19.37	18.59	9.59
Exercisable, end of period, weighted average exercise price	17.16	14.68	$ 8.07
Additional disclosures
Weighted average fair value at grant date of options granted	$ 13.36	$ 12.16
Total intrinsic value of options exercised	$ 822,000	$ 502,000	$ 65,000
Total intrinsic value of options outstanding	7,968,000	1,916,000	1,840,000
Total intrinsic value of options exercisable	$ 4,330,000	$ 1,218,000	$ 993,000
2012 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	20,400	12,000	24,000
Granted	0	9,600	0
Forfeited/Lapsed			(9,600)
Exercised	0	(1,200)	(2,400)
Outstanding, end of period	20,400	20,400	12,000
Exercisable, end of period	13,920	11,280	6,240
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 14.39	$ 6.55	$ 5.15
Granted (per share)		22.93	0
Forfeited/Lapsed (per share)			3.59
Exercised (per share)		4.35	4.35
Weighted average exercise price, end of period	14.39	14.39	6.55
Exercisable, end of period, weighted average exercise price	$ 10.99	8.92	$ 6.04
Additional disclosures
Weighted average fair value at grant date of options granted		$ 12.58
Total intrinsic value of options exercised		$ 19,000	$ 31,000
Total intrinsic value of options outstanding	$ 413,000	149,000	140,000
Total intrinsic value of options exercisable	$ 329,000	$ 136,000	$ 76,000
2018 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	89,000	70,100	96,800
Granted	0	23,500	0
Forfeited/Lapsed			(23,500)
Exercised	(14,000)	(4,600)	(3,200)
Outstanding, end of period	75,000	89,000	70,100
Exercisable, end of period	50,720	45,040	29,960
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 14.91	$ 11.93	$ 11.74
Granted (per share)		22.93
Forfeited/Lapsed (per share)			11.68
Exercised (per share)	15.32	10.43	8.10
Weighted average exercise price, end of period	14.83	14.91	11.93
Exercisable, end of period, weighted average exercise price	$ 12.87	12.98	$ 11.68
Additional disclosures
Weighted average fair value at grant date of options granted		$ 12.58
Total intrinsic value of options exercised	$ 209,000	$ 58,000	$ 29,000
Total intrinsic value of options outstanding	1,486,000	561,000	439,000
Total intrinsic value of options exercisable	$ 1,104,000	$ 354,000	$ 195,000
2020 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	26,900	10,000
Granted	30,000	16,900	10,000
Exercised	0	0	0
Outstanding, end of period	56,900	26,900	10,000
Exercisable, end of period	18,760	7,380	2,000
Weighted average exercise price
Weighted average exercise price, beginning of year	$ 18.64	$ 11.40
Granted (per share)	27.57	22.93	$ 11.40
Weighted average exercise price, end of period	23.35	18.64	11.40
Exercisable, end of period, weighted average exercise price	20.73	16.68	11.40
Additional disclosures
Weighted average fair value at grant date of options granted	$ 13.74	$ 12.58	$ 6.10
Total intrinsic value of options outstanding	$ 643,000	$ 92,000	$ 68,000
Total intrinsic value of options exercisable	$ 261,000	$ 37,000	$ 14,000
2022 Employee Stock Option Plan
Options
Granted	5,000
Exercised	0
Outstanding, end of period	5,000
Exercisable, end of period	1,000
Weighted average exercise price
Granted (per share)	$ 40.01
Weighted average exercise price, end of period	40.01
Exercisable, end of period, weighted average exercise price	40.01
Additional disclosures
Weighted average fair value at grant date of options granted	$ 19.77