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Note 11 - Shareholders' Equity - Stock Option Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Plan 1989 [Member] |  |
Outstanding, options shares (in shares) | 229,000 | 229,000
Outstanding, weighted average exercise price (in dollars per share) | $ 6.05 | $ 6.05
Granted, options shares (in shares) | 125,100 | 0
Exercised, options shares (in shares) | 0 | 0
Forfeited, options shares (in shares) | (2,000) | 0
Granted, weighted average exercise price (in dollars per share) | $ 2.41 |
Forfeited, weighted average exercise price (in dollars per share) | $ 6.05 |
Outstanding, options shares (in shares) | 352,100 | 229,000
Outstanding, weighted average exercise price (in dollars per share) | $ 4.76 | $ 6.05
Outstanding, weighted average remaining contractual life (Year) | 7 years 2 months 23 days |
Outstanding, aggregate intrinsic value | $ 0 |
Outstanding and exercisable, options shares (in shares) | 327,100 |
Outstanding and exercisable, weighted average exercise price (in dollars per share) | $ 4.95 |
Outstanding and exercisable, weighted average remaining contractual life (Year) | 7 years 14 days |
Outstanding and exercisable, aggregate intrinsic value | $ 0 |
Outstanding and non-vested, options shares (in shares) | 25,000 | 0
Outstanding and non-vested, weighted average exercise price (in dollars per share) | $ 2.31 |
Outstanding and non-vested, weighted average remaining contractual life (Year) | 9 years 8 months 4 days |
Outstanding and non-vested, aggregate instrinsic value | $ 6,000 |
Non-vested options (in shares) | 0 |
Non-vested, grant date fair value (in dollars per share) | $ 0 |
Non-vested, fair value | $ 0 |
Granted, grant date fair value (in dollars per share) | $ 1.06 |
Granted, fair value | $ 133,000 |
Vested options (in shares) | 100,100 |
Vested, grant date fair value (in dollars per share) | $ 1.08 |
Vested, fair value | $ 108,000 |
Forfeited non-vested options (in shares) | 0 |
Forfeited, grant date fair value (in dollars per share) | $ 0 |
Forfeited, fair value | $ 0 |
Non-vested options (in shares) | 25,000 | 0
Non-vested, grant date fair value (in dollars per share) | $ 0.99 | $ 0
Non-vested, fair value | $ 25,000 | $ 0
Non-vested, unrecognized compensation expense | $ 9,000 |
Non-vested, remaining recognition period (Year) | 2 months 4 days |
Plan 1997 [Member] |  |
Outstanding, options shares (in shares) | 2,000 | 2,000
Outstanding, weighted average exercise price (in dollars per share) | $ 2.74 | $ 2.74
Granted, options shares (in shares) | 0 | 0
Exercised, options shares (in shares) | 0 | 0
Forfeited, options shares (in shares) | 0 | 0
Outstanding, options shares (in shares) | 2,000 | 2,000
Outstanding, weighted average exercise price (in dollars per share) | $ 2.74 | $ 2.74
Outstanding, weighted average remaining contractual life (Year) | 2 years 8 months 19 days |
Outstanding, aggregate intrinsic value | $ 0 |
Outstanding and exercisable, options shares (in shares) | 2,000 |
Outstanding and exercisable, weighted average exercise price (in dollars per share) | $ 2.74 |
Outstanding and exercisable, weighted average remaining contractual life (Year) | 2 years 8 months 19 days |
Outstanding and exercisable, aggregate intrinsic value | $ 0 |
Outstanding and non-vested, options shares (in shares) | 0 |
Non-vested options (in shares) | 0 |

X
- Definition The fair value of nonvested options. + References No definition available. + Details
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- Definition The fair value of options granted. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of nonvested portions of options outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for unvested portions of options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock 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)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + 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)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + 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)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + 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)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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