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Note 13 - Stock-based Compensation and Purchase Plans (Tables) | 12 Months Ended
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Jun. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Restricted Stock Awards |
|  |  |  |  |  | Weighted |
|  | Number |  |  | Average |
|  | of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Outstanding, June 30, 2021 |  |  | 168,011 |  |  | $ | 74.61 |
Granted |  |  | 48,160 |  |  |  | 104.37 |
Vested |  |  | (68,601 | ) |  |  | 87.53 |
Canceled |  |  | (5,916 | ) |  |  | 50.57 |
Outstanding, June 30, 2022 |  |  | 141,654 |  |  | $ | 78.19 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Risk-free interest rates |  |  | 0.46 | % |  |  | 0.18 | % |  |  | 1.42 | %
Expected life of option grants (in years) |  |  | 3 |  |  |  | 3 |  |  |  | 3 |
Expected volatility of underlying stock |  |  | 46.7 | % |  |  | 44.1 | % |  |  | 32.0 | %
Expected quarterly dividends (per share) |  | $ | 0.24 |  |  | $ | 0.22 |  |  | $ | 0.20 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Annual Component |  |  | Performance Stock Units |
|  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  | Weighted |
|  | Number |  |  | Average |  |  | Aggregate |  |  | Number |  |  | Average |
|  | of |  |  | Exercise |  |  | Intrinsic |  |  | of |  |  | Grant Date |
|  | Shares |  |  | Price |  |  | Value |  |  | Shares |  |  | Fair Value |
Non-vested, June 30, 2021 |  |  | 41,119 |  |  | $ | 54.36 |  |  | $ | 691,647 |  |  |  | 129,427 |  |  | $ | 70.27 |
Granted |  |  | 22,646 |  |  |  | 71.18 |  |  |  |  |  |  |  | 35,113 |  |  |  | 102.61 |
Exercised / vested |  |  | (10,658 | ) |  |  | 76.65 |  |  | $ | 241,723 |  |  |  | (21,307 | ) |  |  | 106.65 |
Forfeited |  |  | 0 |  |  |  | - |  |  |  |  |  |  |  | (1,063 | ) |  |  | 86.47 |
Non-vested, June 30, 2022 |  |  | 53,107 |  |  | $ | 57.06 |  |  | $ | 346,496 |  |  |  | 142,170 |  |  | $ | 72.68 |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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