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Stock Option - Activity (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Weighted average exercise price |  |  |
Weighted average exercise price, bgn | $ 11.40 |  |
Granted (per share) | $ 22.93 | $ 11.40 |
Weighted average exercise price, end |  | 11.40 |
Exercisable, end of period, weighted average exercise price |  | $ 11.40 |
2012 Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 214,080 | 235,680 | 145,000
Granted | 338,000 | 0 | 141,880
Forfeited/Lapsed |  | (13,000) | (20,000)
Exercised | (29,000) | (8,600) | (31,200)
Outstanding, end of period | 523,080 | 214,080 | 235,680
Exercisable, end of period | 176,752 | 98,176 | 70,000
Weighted average exercise price |  |  |
Weighted average exercise price, bgn | $ 9.59 | $ 9.42 | $ 5.51
Granted (per share) | 23.17 |  | 12.25
Forfeited/Lapsed (per share) |  | 6.91 | 9.92
Exercised (per share) | 5.45 | 9.04 | 3.78
Weighted average exercise price, end | 18.59 | 9.59 | 9.42
Exercisable, end of period, weighted average exercise price | 14.68 | $ 8.07 | 6.57
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 12.16 |  | $ 6.72
Total intrinsic value of options exercised | $ 502,000 | $ 65,000 | $ 278,000
Total intrinsic value of options outstanding | 1,916,000 | 1,840,000 | 696,000
Total intrinsic value of options exercisable | $ 1,218,000 | $ 993,000 | $ 389,000
2012 Non-Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 12,000 | 24,000 | 20,400
Granted | 9,600 | 0 | 3,600
Forfeited/Lapsed |  | (9,600) |
Exercised | (1,200) | (2,400) | 0
Outstanding, end of period | 20,400 | 12,000 | 24,000
Exercisable, end of period | 11,280 | 6,240 | 11,520
Weighted average exercise price |  |  |
Weighted average exercise price, bgn | $ 6.55 | $ 5.15 | $ 4.00
Granted (per share) |  |  | 11.68
Forfeited/Lapsed (per share) |  | 3.59 | 0
Exercised (per share) | 4.35 | 4.35 | 0
Weighted average exercise price, end | 14.39 | 6.55 | 5.15
Exercisable, end of period, weighted average exercise price | 8.92 | $ 6.04 | 4.18
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 12.58 |  | $ 6.47
Total intrinsic value of options exercised | $ 19,000 | $ 31,000 |
Total intrinsic value of options outstanding | 149,000 | 140,000 | $ 157,000
Total intrinsic value of options exercisable | $ 136,000 | $ 76,000 | $ 87,000
2018 Non-Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 70,100 | 96,800 | 30,400
Granted | 23,500 | 0 | 66,400
Forfeited/Lapsed |  | (23,500) |
Exercised | (4,600) | (3,200) | 0
Outstanding, end of period | 89,000 | 70,100 | 96,800
Exercisable, end of period | 45,040 | 29,960 | 24,480
Weighted average exercise price |  |  |
Weighted average exercise price, bgn | $ 11.93 | $ 11.74 | $ 8.10
Granted (per share) | 22.93 |  | 13.41
Forfeited/Lapsed (per share) |  | 11.68 |
Exercised (per share) | 10.43 | 8.10 |
Weighted average exercise price, end | 14.91 | 11.93 | 11.74
Exercisable, end of period, weighted average exercise price | 12.98 | $ 11.68 | 10.98
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 12.58 |  | $ 7.55
Total intrinsic value of options exercised | $ 58,000 | $ 29,000 |
Total intrinsic value of options outstanding | 561,000 | 439,000 | $ 110,000
Total intrinsic value of options exercisable | $ 354,000 | $ 195,000 | $ 40,000
2020 Non-Employee Stock Option Plan |  |  |
Options |  |  |
Outstanding, beginning of year | 10,000 |  |
Granted | 16,900 | 10,000 | 0
Exercised | 0 | 0 | 0
Outstanding, end of period | 26,900 | 10,000 |
Exercisable, end of period | 7,380 | 2,000 |
Weighted average exercise price |  |  |
Weighted average exercise price, bgn | $ 11.40 |  |
Granted (per share) | 22.93 |  |
Weighted average exercise price, end | 18.64 | $ 11.40 |
Exercisable, end of period, weighted average exercise price | 16.68 |  |
Additional disclosures |  |  |
Weighted average fair value at grant date of options granted | $ 12.58 | $ 6.10 |
Total intrinsic value of options outstanding | $ 92,000 | $ 68,000 |
Total intrinsic value of options exercisable | $ 37,000 | $ 14,000 |

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