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Stock Option - Activity (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
2012 Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 523,080 | 214,080 | 235,680
Granted | 37,500 | 338,000 | 0
Forfeited/Lapsed |  |  | (13,000)
Exercised | (39,000) | (29,000) | (8,600)
Outstanding, end of period | 521,580 | 523,080 | 214,080
Exercisable, end of period | 247,628 | 176,752 | 98,176
Weighted average exercise price |  |  |
Weighted average exercise price, beginning of year | $ 18.59 | $ 9.59 | $ 9.42
Granted (per share) | 26.94 | 23.17 |
Forfeited/Lapsed (per share) |  |  | 6.91
Exercised (per share) | 10.44 | 5.45 | 9.04
Weighted average exercise price, end of period | 19.37 | 18.59 | 9.59
Exercisable, end of period, weighted average exercise price | 17.16 | 14.68 | $ 8.07
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 13.36 | $ 12.16 |
Total intrinsic value of options exercised | $ 822,000 | $ 502,000 | $ 65,000
Total intrinsic value of options outstanding | 7,968,000 | 1,916,000 | 1,840,000
Total intrinsic value of options exercisable | $ 4,330,000 | $ 1,218,000 | $ 993,000
2012 Non-Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 20,400 | 12,000 | 24,000
Granted | 0 | 9,600 | 0
Forfeited/Lapsed |  |  | (9,600)
Exercised | 0 | (1,200) | (2,400)
Outstanding, end of period | 20,400 | 20,400 | 12,000
Exercisable, end of period | 13,920 | 11,280 | 6,240
Weighted average exercise price |  |  |
Weighted average exercise price, beginning of year | $ 14.39 | $ 6.55 | $ 5.15
Granted (per share) |  | 22.93 | 0
Forfeited/Lapsed (per share) |  |  | 3.59
Exercised (per share) |  | 4.35 | 4.35
Weighted average exercise price, end of period | 14.39 | 14.39 | 6.55
Exercisable, end of period, weighted average exercise price | $ 10.99 | 8.92 | $ 6.04
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted |  | $ 12.58 |
Total intrinsic value of options exercised |  | $ 19,000 | $ 31,000
Total intrinsic value of options outstanding | $ 413,000 | 149,000 | 140,000
Total intrinsic value of options exercisable | $ 329,000 | $ 136,000 | $ 76,000
2018 Non-Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 89,000 | 70,100 | 96,800
Granted | 0 | 23,500 | 0
Forfeited/Lapsed |  |  | (23,500)
Exercised | (14,000) | (4,600) | (3,200)
Outstanding, end of period | 75,000 | 89,000 | 70,100
Exercisable, end of period | 50,720 | 45,040 | 29,960
Weighted average exercise price |  |  |
Weighted average exercise price, beginning of year | $ 14.91 | $ 11.93 | $ 11.74
Granted (per share) |  | 22.93 |
Forfeited/Lapsed (per share) |  |  | 11.68
Exercised (per share) | 15.32 | 10.43 | 8.10
Weighted average exercise price, end of period | 14.83 | 14.91 | 11.93
Exercisable, end of period, weighted average exercise price | $ 12.87 | 12.98 | $ 11.68
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted |  | $ 12.58 |
Total intrinsic value of options exercised | $ 209,000 | $ 58,000 | $ 29,000
Total intrinsic value of options outstanding | 1,486,000 | 561,000 | 439,000
Total intrinsic value of options exercisable | $ 1,104,000 | $ 354,000 | $ 195,000
2020 Non-Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 26,900 | 10,000 |
Granted | 30,000 | 16,900 | 10,000
Exercised | 0 | 0 | 0
Outstanding, end of period | 56,900 | 26,900 | 10,000
Exercisable, end of period | 18,760 | 7,380 | 2,000
Weighted average exercise price |  |  |
Weighted average exercise price, beginning of year | $ 18.64 | $ 11.40 |
Granted (per share) | 27.57 | 22.93 | $ 11.40
Weighted average exercise price, end of period | 23.35 | 18.64 | 11.40
Exercisable, end of period, weighted average exercise price | 20.73 | 16.68 | 11.40
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 13.74 | $ 12.58 | $ 6.10
Total intrinsic value of options outstanding | $ 643,000 | $ 92,000 | $ 68,000
Total intrinsic value of options exercisable | $ 261,000 | $ 37,000 | $ 14,000
2022 Employee Stock Option Plan |  |  |
Options |  |  |
Granted | 5,000 |  |
Exercised | 0 |  |
Outstanding, end of period | 5,000 |  |
Exercisable, end of period | 1,000 |  |
Weighted average exercise price |  |  |
Granted (per share) | $ 40.01 |  |
Weighted average exercise price, end of period | 40.01 |  |
Exercisable, end of period, weighted average exercise price | 40.01 |  |
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 19.77 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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