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Note 9 - Common Stock Incentive, Stock Purchase Plans, and Other Compensation Plans (Tables) | 12 Months Ended
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Jun. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  | Shares |  |  | Average |
|  |  |  |  | Exercise Price |
Outstanding at June 30, 2023 |  |  | 38,166 |  |  | $ | 27.34 |
Granted |  |  | 131,840 |  |  |  | 10.01 |
Exercised |  |  | - |  |  |  | - |
Canceled or expired |  |  | (13,378 | ) |  |  | 10.70 |
Outstanding at June 30, 2024 |  |  | 156,628 |  |  | $ | 14.18 |
Granted |  |  | 102,260 |  |  |  | 9.43 |
Exercised |  |  | - |  |  |  | - |
Canceled or expired |  |  | (45,775 | ) |  |  | 12.10 |
Outstanding at June 30, 2025 |  |  | 213,113 |  |  | $ | 12.35 |
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  |  |  |  |  | Options |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Outstanding |  |  |  |  |  |  |  |  |  |  | Options |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |  |  |  |  | Exercisable |
|  |  |  |  |  | Average |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  | Number |  |  | Remaining |  |  | Average |  |  | Number |  |  | Average |
|  | Outstanding |  |  | Contractual |  |  | Exercise |  |  | Exercisable |  |  | Exercise |
Range of exercise prices |  |  |  |  | Life (years) |  |  | Price |  |  |  |  |  | Price |
$5.50 – $9.69 |  |  | 55,000 |  |  |  | 9.45 |  |  | $ | 7.41 |  |  |  | 2,551 |  |  | $ | 9.21 |
$10.10 – $11.27 |  |  | 79,770 |  |  |  | 8.24 |  |  |  | 10.12 |  |  |  | 27,720 |  |  |  | 10.14 |
$11.51 – $19.20 |  |  | 76,402 |  |  |  | 8.22 |  |  |  | 14.21 |  |  |  | 29,422 |  |  |  | 18.42 |
$159.00 – $175.50 |  |  | 1,941 |  |  |  | 1.86 |  |  |  | 170.33 |  |  |  | 1,941 |  |  |  | 170.33 |
$5.50 – $175.50 |  |  | 213,113 |  |  |  | 8.49 |  |  | $ | 12.35 |  |  |  | 61,634 |  |  | $ | 19.10 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Shares |  |  | Grant-Date |
|  |  |  |  |  | Fair Value |
Outstanding at June 30, 2023 |  |  | 50,671 |  |  | $ | 33.43 |
Granted |  |  | 20,000 |  |  |  | 10.10 |
Vested |  |  | (26,898 | ) |  |  | 45.50 |
Canceled or expired |  |  | - |  |  |  | - |
Outstanding at June 30, 2024 |  |  | 43,773 |  |  | $ | 15.36 |
Granted |  |  | 65,000 |  |  |  | 5.90 |
Vested |  |  | (15,163 | ) |  |  | 14.85 |
Canceled or expired |  |  | (7,776 | ) |  |  | 10.97 |
Outstanding at June 30, 2025 |  |  | 85,834 |  |  | $ | 14.11 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended |  |  | Year Ended |
(in thousands) |  | June 30, 2025 |  |  | June 30, 2024 |
Selling, Administration and General |  | $ | 665 |  |  | $ | 1,364 |
Research & Development |  |  | 165 |  |  |  | 114 |
Total |  | $ | 830 |  |  | $ | 1,478 |
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Year Ended |  |  | Year Ended |
|  | June 30, 2025 |  |  | June 30, 2024 |
Expected Dividend Yield |  |  | - |  |  |  | - |
Expected Volatility |  |  | 100.06 | % |  |  | 99.85 | %
Risk-Free Interest Rates |  |  | 4.24 | % |  |  | 4.36 | %
Expected Option Life (in years) |  |  | 3.5 |  |  |  | 3.5 |
Weighted-average grant-date fair value of options awarded |  | $ | 15.80 |  |  | $ | 11.63 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718-50/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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