Stock Options - Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
2012 Employee Stock Option Plan
Options
Outstanding, beginning of year			363,036	521,580
Forfeited/Lapsed				(11,000)
Exercised	0	(115,944)	(2,000)	(147,544)
Outstanding, end of period	361,036	363,036	361,036	363,036
Exercisable, end of period	265,660	178,984	265,660	178,984
Weighted average exercise price
Weighted average exercise price, beginning of year			$ 21.47	$ 19.37
Forfeited/Lapsed (per share)				3.15
Exercised (per share)			26.94	15.43
Weighted average exercise price, end of period	$ 21.44	$ 21.47	21.44	21.47
Exercisable, end of period, weighted average exercise price	$ 21.36	$ 21.59	$ 21.36	$ 21.59
Additional disclosures
Total intrinsic value of options exercised			$ 35,000	$ 3,972,000
Total intrinsic value of options outstanding	$ 696,000	$ 6,787,000	696,000	6,787,000
Total intrinsic value of options exercisable	$ 505,000	$ 3,323,000	$ 505,000	$ 3,323,000
2012 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			20,400	20,400
Exercised	0	0	0	0
Outstanding, end of period	20,400	20,400	20,400	20,400
Exercisable, end of period	18,480	16,560	18,480	16,560
Weighted average exercise price
Weighted average exercise price, beginning of year			$ 14.39	$ 14.39
Weighted average exercise price, end of period	$ 14.39	$ 14.39	14.39	14.39
Exercisable, end of period, weighted average exercise price	$ 13.5	$ 12.41	$ 13.5	$ 12.41
Additional disclosures
Total intrinsic value of options outstanding	$ 176,000	$ 526,000	$ 176,000	$ 526,000
Total intrinsic value of options exercisable	$ 176,000	$ 460,000	$ 176,000	$ 460,000
2018 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			68,900	75,000
Granted			0	0
Forfeited/Lapsed			(4,000)
Exercised	0	(1,500)	0	(3,100)
Outstanding, end of period	64,900	71,900	64,900	71,900
Exercisable, end of period	62,200	62,500	62,200	62,500
Weighted average exercise price
Weighted average exercise price, beginning of year			$ 14.54	$ 14.83
Forfeited/Lapsed (per share)			22.93
Exercised (per share)				18.98
Weighted average exercise price, end of period	$ 14.02	$ 14.65	14.02	14.65
Exercisable, end of period, weighted average exercise price	$ 13.63	$ 13.41	$ 13.63	$ 13.41
Additional disclosures
Total intrinsic value of options exercised				$ 59,000
Total intrinsic value of options outstanding	$ 584,000	$ 1,834,000	$ 584,000	1,834,000
Total intrinsic value of options exercisable	$ 584,000	$ 1,672,000	$ 584,000	$ 1,672,000
2020 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			56,900	56,900
Granted			0	0
Forfeited/Lapsed			(2,000)
Exercised	0	0	(3,000)	0
Outstanding, end of period	51,900	56,900	51,900	56,900
Exercisable, end of period	38,520	30,140	38,520	30,140
Weighted average exercise price
Weighted average exercise price, beginning of year			$ 23.35	$ 23.35
Forfeited/Lapsed (per share)			26.94
Exercised (per share)			26.94
Weighted average exercise price, end of period	$ 23	$ 23.35	23	23.35
Exercisable, end of period, weighted average exercise price	$ 21.79	$ 21.72	$ 21.79	$ 21.72
Additional disclosures
Total intrinsic value of options exercised			$ 32,000
Total intrinsic value of options outstanding	$ 118,000	$ 957,000	118,000	$ 957,000
Total intrinsic value of options exercisable	$ 117,000	$ 556,000	$ 117,000	$ 556,000
2022 Employee Stock Option Plan
Options
Outstanding, beginning of year			130,000	5,000
Granted		0	0	10,000
Forfeited/Lapsed				(5,000)
Exercised	0	0	0	0
Outstanding, end of period	130,000	10,000	130,000	10,000
Exercisable, end of period	28,000	2,000	28,000	2,000
Weighted average exercise price
Weighted average exercise price, beginning of year			$ 41.38	$ 40.01
Granted (per share)				21.6
Forfeited/Lapsed (per share)				40.01
Weighted average exercise price, end of period	$ 41.38	$ 21.6	41.38	21.6
Exercisable, end of period, weighted average exercise price	$ 39.96	$ 21.6	$ 39.96	21.6
Additional disclosures
Weighted average fair value at grant date of options granted				$ 9.75
Total intrinsic value of options outstanding	$ 14,000	$ 186,000	$ 14,000	$ 186,000
Total intrinsic value of options exercisable	$ 6,000	$ 37,000	$ 6,000	$ 37,000