Stock Option - Activity (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Weighted average exercise price
Weighted average exercise price, bgn	$ 11.40
Granted (per share)	$ 22.93	$ 11.40
Weighted average exercise price, end		11.40
Exercisable, end of period, weighted average exercise price		$ 11.40
2012 Employee Stock Option Plan
Options
Outstanding, beginning of year	214,080	235,680	145,000
Granted	338,000	0	141,880
Forfeited/Lapsed		(13,000)	(20,000)
Exercised	(29,000)	(8,600)	(31,200)
Outstanding, end of period	523,080	214,080	235,680
Exercisable, end of period	176,752	98,176	70,000
Weighted average exercise price
Weighted average exercise price, bgn	$ 9.59	$ 9.42	$ 5.51
Granted (per share)	23.17		12.25
Forfeited/Lapsed (per share)		6.91	9.92
Exercised (per share)	5.45	9.04	3.78
Weighted average exercise price, end	18.59	9.59	9.42
Exercisable, end of period, weighted average exercise price	14.68	$ 8.07	6.57
Additional disclosures
Weighted average fair value at grant date of options granted	$ 12.16		$ 6.72
Total intrinsic value of options exercised	$ 502,000	$ 65,000	$ 278,000
Total intrinsic value of options outstanding	1,916,000	1,840,000	696,000
Total intrinsic value of options exercisable	$ 1,218,000	$ 993,000	$ 389,000
2012 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	12,000	24,000	20,400
Granted	9,600	0	3,600
Forfeited/Lapsed		(9,600)
Exercised	(1,200)	(2,400)	0
Outstanding, end of period	20,400	12,000	24,000
Exercisable, end of period	11,280	6,240	11,520
Weighted average exercise price
Weighted average exercise price, bgn	$ 6.55	$ 5.15	$ 4.00
Granted (per share)			11.68
Forfeited/Lapsed (per share)		3.59	0
Exercised (per share)	4.35	4.35	0
Weighted average exercise price, end	14.39	6.55	5.15
Exercisable, end of period, weighted average exercise price	8.92	$ 6.04	4.18
Additional disclosures
Weighted average fair value at grant date of options granted	$ 12.58		$ 6.47
Total intrinsic value of options exercised	$ 19,000	$ 31,000
Total intrinsic value of options outstanding	149,000	140,000	$ 157,000
Total intrinsic value of options exercisable	$ 136,000	$ 76,000	$ 87,000
2018 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	70,100	96,800	30,400
Granted	23,500	0	66,400
Forfeited/Lapsed		(23,500)
Exercised	(4,600)	(3,200)	0
Outstanding, end of period	89,000	70,100	96,800
Exercisable, end of period	45,040	29,960	24,480
Weighted average exercise price
Weighted average exercise price, bgn	$ 11.93	$ 11.74	$ 8.10
Granted (per share)	22.93		13.41
Forfeited/Lapsed (per share)		11.68
Exercised (per share)	10.43	8.10
Weighted average exercise price, end	14.91	11.93	11.74
Exercisable, end of period, weighted average exercise price	12.98	$ 11.68	10.98
Additional disclosures
Weighted average fair value at grant date of options granted	$ 12.58		$ 7.55
Total intrinsic value of options exercised	$ 58,000	$ 29,000
Total intrinsic value of options outstanding	561,000	439,000	$ 110,000
Total intrinsic value of options exercisable	$ 354,000	$ 195,000	$ 40,000
2020 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year	10,000
Granted	16,900	10,000	0
Exercised	0	0	0
Outstanding, end of period	26,900	10,000
Exercisable, end of period	7,380	2,000
Weighted average exercise price
Weighted average exercise price, bgn	$ 11.40
Granted (per share)	22.93
Weighted average exercise price, end	18.64	$ 11.40
Exercisable, end of period, weighted average exercise price	16.68
Additional disclosures
Weighted average fair value at grant date of options granted	$ 12.58	$ 6.10
Total intrinsic value of options outstanding	$ 92,000	$ 68,000
Total intrinsic value of options exercisable	$ 37,000	$ 14,000