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Employee Benefits (Tables) | 12 Months Ended
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Jun. 30, 2025
Employee Benefits |
Schedule of changes in options outstanding under the 2003 Plan, the 2017 Plan, and the 2024 Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025 | ​ | 2024 | ​ | 2023
​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​
​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​
​ | ​ | Price | ​ | Number | ​ | Price | ​ | Number | ​ | Price | ​ | Number
Outstanding at beginning of year | ​ | $ | 34.43 | ​ | 140,500 | ​ | $ | 39.63 | ​ | 148,000 | ​ | $ | 36.56 | ​ | 104,000
Granted | ​ | ​ | 60.42 | ​ | 12,000 | ​ | ​ | 40.74 | ​ | 23,500 | ​ | ​ | 38.58 | ​ | 44,000
Exercised | ​ | ​ | — | ​ | — | ​ | ​ | 24.49 | ​ | (16,000) | ​ | ​ | — | ​ | —
Forfeited |  | ​ | — | ​ | — |  | ​ | 42.35 | ​ | (15,000) |  | ​ | — | ​ | —
Outstanding at year-end | ​ | $ | 42.76 | ​ | 152,500 | ​ | $ | 34.43 | ​ | 140,500 | ​ | $ | 39.63 | ​ | 148,000
Options exercisable at year-end | ​ | $ | 39.51 | ​ | 88,500 | ​ | $ | 38.44 | ​ | 65,800 | ​ | $ | 33.89 | ​ | 63,700
Schedule of assumptions used in determining the fair values of options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025 | ​ | 2024 | ​ | 2023 | ​
Assumptions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected dividend yield | ​ | ​ | 1.52 | % | ​ | 2.06 | % | ​ | 1.79 | %
Expected volatility |  | ​ | 36.53 | % | ​ | 34.89 | % | ​ | 29.67 | %
Risk-free interest rate | ​ | ​ | 4.55 | % | ​ | 4.12 | % | ​ | 3.79 | %
Weighted-average expected life (years) | ​ | ​ | 10.00 | ​ | ​ | 10.00 | ​ | ​ | 10.00 | ​
Weighted-average fair value of options granted during the year | ​ | $ | 27.06 | ​ | $ | 15.88 | ​ | $ | 16.68 | ​
Schedule of information about stock options outstanding under the 2017 Plan, and the 2024 Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted | ​ | Options Outstanding | ​ | Options Exercisable
Average | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
Remaining | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
Contractual | ​ | Number | ​ | Exercise | ​ | Number | ​ | Exercise
Life | ​ | Outstanding | ​ | Price | ​ | Exercisable | ​ | Price
31 mo. | ​ | 11,500 | ​ | ​ | 37.31 | ​ | 11,500 | ​ | ​ | 37.31
42 mo. | ​ | 15,500 | ​ | ​ | 34.35 | ​ | 15,500 | ​ | ​ | 34.35
56 mo. | ​ | 15,500 | ​ | ​ | 37.40 | ​ | 15,500 | ​ | ​ | 37.40
67 mo. | ​ | 23,000 | ​ | ​ | 34.91 | ​ | 18,400 | ​ | ​ | 34.91
79 mo. | ​ | 11,500 | ​ | ​ | 53.82 | ​ | 6,900 | ​ | ​ | 53.82
85 mo. | ​ | 7,500 | ​ | ​ | 46.59 | ​ | 3,000 | ​ | ​ | 46.59
92 mo. | ​ | 32,500 | ​ | ​ | 46.94 | ​ | 13,000 | ​ | ​ | 46.94
99 mo. | ​ | 3,500 | ​ | ​ | 40.28 | ​ | 700 | ​ | ​ | 40.28
103 mo. | ​ | 20,000 | ​ | ​ | 40.82 | ​ | 4,000 | ​ | ​ | 40.82
116 mo. | ​ | 12,000 | ​ | ​ | 60.42 | ​ | — | ​ | ​ | 60.42
​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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