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Note 15 - Equity Incentive Plans (Tables) | 12 Months Ended
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Jun. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
​ |  |  |  |  |  | ​ |  |  | Weighted |
​ |  | ​ |  |  | ​ |  |  | Average |
​ |  | ​ |  |  | Weighted |  |  | Remaining |
​ |  | Number of |  |  | Average |  |  | Contractual |
​ |  | Options |  |  | Exercise Price |  |  | Life in Years |
Outstanding at June 30, 2023 |  |  | 52,762 |  |  | $ | 18.37 |  |  |  | 9.1 |
Granted |  |  | 113,500 |  |  | $ | 1.74 |  |  |  | 9.2 |
Forfeited/cancelled |  |  | (16,610 | ) |  | $ | 3.20 |  |  |  | — |
Expired |  |  | (3,113 | ) |  | $ | 66.84 |  |  |  | — |
Outstanding at June 30, 2024 |  |  | 146,539 |  |  | $ | 6.18 |  |  |  | 8.8 |
​ |  | ​ |  |  | ​ |  |  | ​ |
Exercisable at June 30, 2024 |  |  | 25,068 |  |  | $ | 26.06 |  |  |  | 8.0 |
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
​ |  |  |  |  |  |  |  |  | ​ |  |  | Weighted |  |  |  |  |  |  | ​ |
​ |  |  |  |  | ​ |  |  | ​ |  |  | Average |  |  | ​ |  |  | ​ |
​ |  |  |  |  | ​ |  |  | ​ |  |  | Remaining |  |  | ​ |  |  | ​ |
​ |  |  |  |  | ​ |  |  | Weighted |  |  | Contractual |  |  | ​ |  |  | ​ |
Range of |  |  | Number of |  |  | Average |  |  | Life of |  |  | Number of |  |  | Weighted |
Exercise |  |  | Options |  |  | Exercise |  |  | Options |  |  | Options |  |  | Average |
Prices |  |  | Outstanding |  |  | Price |  |  | Outstanding |  |  | Exercisable |  |  | Exercise Price |
| $1.73 |  |  |  |  | 102,000 |  |  | $ | 1.73 |  |  |  | 9.1 |  |  |  | — |  |  | $ | — |
| $2.53 |  |  |  |  | 1,500 |  |  | $ | 2.53 |  |  |  | 9.6 |  |  |  | — |  |  | $ | — |
$4.00 | - | $290.00 |  |  |  | 43,039 |  |  | $ | 16.85 |  |  |  | 8.1 |  |  |  | 25,068 |  |  | $ | 225.74 |
​ |  |  |  |  |  | 146,539 |  |  | $ | 6.18 |  |  |  | 8.8 |  |  |  | 25,068 |  |  | $ | 225.74 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
​ |  | ​ |  |  | Weighted |
​ |  | ​ |  |  | Average Grant |
​ |  | Number of |  |  | Date Fair |
​ |  | Shares |  |  | Value |
Unvested at June 30, 2023 |  |  | 38,075 |  |  | $ | 142.20 |
Granted |  |  | 12,500 |  |  | $ | 1.77 |
Vested |  |  | (25,971 | ) |  | $ | 113.37 |
Forfeited/cancelled |  |  | (499 | ) |  | $ | 147.15 |
Unvested at June 30, 2024 |  |  | 24,105 |  |  | $ | 100.34 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
​ |  | ​ |  |  | Weighted |
​ |  | ​ |  |  | Average Grant |
​ |  | Number of |  |  | Date Fair |
​ |  | Shares |  |  | Value |
Unvested at June 30, 2023 |  |  | 4,963 |  |  | $ | 25.62 |
Vested |  |  | (2,249 | ) |  | $ | 24.28 |
Forfeited/cancelled |  |  | (939 | ) |  | $ | 31.60 |
Unvested at June 30, 2024 |  |  | 1,775 |  |  | $ | 24.14 |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
​ |  | Year Ended |
​ |  | June 30, |
​ |  | 2024 |  |  | 2023 |
​ |  | (in thousands) |
Cost of sales |  | $ | 2 |  |  | $ | 28 |
Research and development |  |  | 6 |  |  |  | 30 |
Selling and marketing |  |  | — |  |  |  | 23 |
General and administrative |  |  | 2,365 |  |  |  | 5,641 |
Total stock-based compensation expense |  | $ | 2,373 |  |  | $ | 5,722 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 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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