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Employee Benefits (Tables) | 12 Months Ended
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Jun. 30, 2023
Employee Benefits |
Schedule of changes in options outstanding under the 2003 Plan and the 2017 Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​
​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​
​ | ​ | Price | ​ | Number | ​ | Price | ​ | Number | ​ | Price | ​ | Number
Outstanding at beginning of year | ​ | $ | 36.56 | ​ | 104,000 | ​ | $ | 33.77 | ​ | 89,500 | ​ | $ | 33.22 | ​ | 60,500
Granted | ​ | ​ | 38.58 | ​ | 44,000 | ​ | ​ | 53.82 | ​ | 14,500 | ​ | ​ | 34.91 | ​ | 29,000
Exercised | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | —
Forfeited |  | ​ | — | ​ | — |  | ​ | — | ​ | — |  | ​ | — | ​ | —
Outstanding at year-end | ​ | $ | 39.63 | ​ | 148,000 | ​ | $ | 36.56 | ​ | 104,000 | ​ | $ | 33.77 | ​ | 89,500
Options exercisable at year-end | ​ | $ | 33.89 | ​ | 63,700 | ​ | $ | 31.92 | ​ | 44,900 | ​ | $ | 29.79 | ​ | 29,000
Schedule of values of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​
Assumptions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected dividend yield | ​ | ​ | 1.79 | % | ​ | 1.49 | % | ​ | 1.83 | %
Expected volatility |  | ​ | 29.67 | % | ​ | 28.02 | % | ​ | 27.72 | %
Risk-free interest rate | ​ | ​ | 3.79 | % | ​ | 1.82 | % | ​ | 1.14 | %
Weighted-average expected life (years) | ​ | ​ | 10.00 | ​ | ​ | 10.00 | ​ | ​ | 10.00 | ​
Weighted-average fair value of options granted during the year | ​ | $ | 16.68 | ​ | $ | 16.38 | ​ | $ | 9.19 | ​
Schedule of stock options under the 2003 Plan and 2017 Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted | ​ | Options Outstanding | ​ | Options Exercisable
Average | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
Remaining | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
Contractual | ​ | Number | ​ | Exercise | ​ | Number | ​ | Exercise
Life | ​ | Outstanding | ​ | Price | ​ | Exercisable | ​ | Price
14 mo. | ​ | 10,000 | ​ | $ | 17.55 | ​ | 10,000 | ​ | $ | 17.55
55 mo. | ​ | 13,500 | ​ | ​ | 37.31 | ​ | 13,500 | ​ | ​ | 37.31
66 mo. | ​ | 17,500 | ​ | ​ | 34.35 | ​ | 14,000 | ​ | ​ | 34.35
80 mo. | ​ | 19,500 | ​ | ​ | 37.40 | ​ | 11,700 | ​ | ​ | 37.40
91 mo. | ​ | 29,000 | ​ | ​ | 34.91 | ​ | 11,600 | ​ | ​ | 34.91
103 mo. | ​ | 14,500 | ​ | ​ | 53.82 | ​ | 2,900 | ​ | ​ | 53.82
109 mo. | ​ | 7,500 | ​ | ​ | 46.59 | ​ | — | ​ | ​ | 46.59
116 mo. | ​ | 36,500 | ​ | ​ | 46.94 | ​ | — | ​ | ​ | 46.94

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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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