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Employee Benefits (Tables) | 12 Months Ended
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Jun. 30, 2020
Employee Benefits |
Schedule of changes in options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
|  | Weighted |  |  |  | Weighted |  |  |  | Weighted |  |
| ​ | Average | ​ |  | ​ | Average | ​ |  | ​ | Average | ​ |
| ​ | Price | ​ | Number | ​ | Price | ​ | Number | ​ | Price | ​ | Number
Outstanding at beginning of year | ​ | $ | 26.35 |  | 51,000 | ​ | $ | 22.18 |  | 33,500 | ​ | $ | 9.35 |  | 44,000
Granted | ​ |  | 37.40 |  | 19,500 | ​ |  | 34.35 |  | 17,500 | ​ |  | 37.31 |  | 13,500
Exercised | ​ |  | 6.38 |  | (10,000) | ​ |  | — |  | — | ​ |  | 7.18 |  | (24,000)
Forfeited | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — |  | —
Outstanding at year-end | ​ | $ | 33.22 |  | 60,500 | ​ | $ | 26.35 |  | 51,000 | ​ | $ | 22.18 |  | 33,500
Options exercisable at year-end | ​ | $ | 26.31 |  | 18,900 | ​ | $ | 14.73 |  | 20,700 | ​ | $ | 10.57 |  | 16,000
Schedule of values of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 |
Assumptions: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Expected dividend yield |  | ​ | 1.60 | % | ​ | 1.51 | % | ​ | 1.18 | %
Expected volatility |  | ​ | 22.55 | % | ​ | 20.39 | % | ​ | 20.42 | %
Risk-free interest rate |  | ​ | 1.55 | % | ​ | 2.67 | % | ​ | 2.54 | %
Weighted-average expected life (years) |  | ​ | 10.00 |  | ​ | 10.00 |  | ​ | 10.00 | ​
Weighted-average fair value of options granted during the year | ​ | $ | 8.81 | ​ | $ | 8.78 | ​ | $ | 10.14 | ​
Schedule of stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted |  | Options Outstanding |  | Options Exercisable
Average | ​ |  | ​ | Weighted | ​ |  | ​ | Weighted
Remaining | ​ |  | ​ | Average | ​ |  | ​ | Average
Contractual | ​ | Number | ​ | Exercise | ​ | Number | ​ | Exercise
Life | ​ | Outstanding | ​ | Price | ​ | Exercisable | ​ | Price
50.2 mo. |  | 10,000 | ​ | $ | 17.55 |  | 10,000 | ​ | $ | 17.55
90.6 mo. |  | 13,500 | ​ |  | 37.31 |  | 5,400 | ​ |  | 37.31
102.2 mo. |  | 17,500 | ​ |  | 34.35 |  | 3,500 | ​ |  | 34.35
115.7 mo. |  | 19,500 | ​ |  | 37.40 |  | — | ​ |  | 37.40

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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