Stock Option - Activity (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Weighted average exercise price
Granted (per share)				$ 11.40
Weighted average exercise price, end		$ 11.40		11.40
Exercisable, end of period, weighted average exercise price		$ 11.40		$ 11.40
2012 Employee Stock Option Plan
Options
Outstanding, beginning of year			214,080	235,680	235,680
Granted	0	0	338,000	0
Forfeited/Lapsed				(8,000)
Exercised	(1,000)		(29,000)	(3,600)
Outstanding, end of period	523,080	224,080	523,080	224,080	214,080
Exercisable, end of period	164,776	89,200	164,776	89,200
Weighted average exercise price
Weighted average exercise price, bgn			$ 9.59	$ 9.42	$ 9.42
Granted (per share)			23.17
Forfeited/Lapsed (per share)				4.08
Exercised (per share)			5.45	5.70
Weighted average exercise price, end	$ 18.59	$ 9.67	18.59	9.67	$ 9.59
Exercisable, end of period, weighted average exercise price	$ 15.01	$ 7.92	15.01	$ 7.92
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.16
Total intrinsic value of options exercised			$ 502,000	$ 42,000
Total intrinsic value of options outstanding	$ 1,903,000	$ 1,735,000	1,903,000	1,735,000
Total intrinsic value of options exercisable	$ 1,085,000	$ 847,000	$ 1,085,000	$ 847,000
2012 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			12,000	24,000	24,000
Granted	0		9,600	0
Exercised	0	(2,400)	0	(2,400)
Outstanding, end of period	21,600	21,600	21,600	21,600	12,000
Exercisable, end of period	12,480	14,640	12,480	14,640
Weighted average exercise price
Weighted average exercise price, bgn			$ 6.55	$ 5.15	$ 5.15
Granted (per share)			22.93
Exercised (per share)			0	4.35
Weighted average exercise price, end	$ 13.83	$ 5.23	13.83	5.23	$ 6.55
Exercisable, end of period, weighted average exercise price	$ 8.48	$ 4.57	8.48	$ 4.57
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.58
Total intrinsic value of options exercised				$ 31,000
Total intrinsic value of options outstanding	$ 168,000	$ 263,000	$ 168,000	263,000
Total intrinsic value of options exercisable	$ 155,000	$ 188,000	$ 155,000	$ 188,000
2018 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			70,100	96,800	96,800
Granted	0	0	23,500	0
Exercised	(1,600)	(3,200)	(4,600)	(3,200)
Outstanding, end of period	89,000	93,600	89,000	93,600	70,100
Exercisable, end of period	45,040	40,960	45,040	40,960
Weighted average exercise price
Weighted average exercise price, bgn			$ 11.93	$ 11.74	$ 11.74
Granted (per share)			22.93
Exercised (per share)			10.43	8.10
Weighted average exercise price, end	$ 14.91	$ 11.87	14.91	11.87	$ 11.93
Exercisable, end of period, weighted average exercise price	$ 12.98	$ 11.54	12.98	$ 11.54
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.58
Total intrinsic value of options exercised			$ 58,000	$ 30,000
Total intrinsic value of options outstanding	$ 556,000	$ 519,000	556,000	519,000
Total intrinsic value of options exercisable	$ 351,000	$ 241,000	$ 351,000	$ 241,000
2020 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			10,000	0	0
Granted	0	0	16,900	10,000
Exercised	0	0	0	0
Outstanding, end of period	26,900	10,000	26,900	10,000	10,000
Exercisable, end of period	7,380	2,000	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		18.64		$ 11.40
Exercisable, end of period, weighted average exercise price	$ 16.68		16.68
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.58	$ 6.10
Total intrinsic value of options outstanding	$ 91,000	$ 60,000	$ 91,000	$ 60,000
Total intrinsic value of options exercisable	$ 36,000	$ 12,000	$ 36,000	$ 12,000