Note 9 - Income Taxes (Tables)
|
12 Months Ended |
Jun. 30, 2026 |
| Notes Tables |
|
| Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
| | | Year Ended June 30, | |
| | | 2026 | | | 2025 | |
| Pretax income (loss): | | | | | | | | |
| United States | | $ | (24,582,719 | ) | | $ | (14,118,076 | ) |
| Foreign | | | 4,351,869 | | | | (717,316 | ) |
| Loss before income taxes | | $ | (20,230,850 | ) | | $ | (14,835,392 | ) |
|
| Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
| | | Year Ended June 30, | |
| | | 2026 | | | 2025 | |
| Current: | | | | | | | | |
| Federal tax | | $ | — | | | $ | — | |
| State | | | 51,246 | | | | 22,168 | |
| Foreign | | | 231,756 | | | | 224,743 | |
| Total current | | | 283,002 | | | | 246,911 | |
| | | | | | | | | |
| Deferred: | | | | | | | | |
| Federal tax | | | — | | | | (30,752 | ) |
| State | | | (63,330 | ) | | | (5,798 | ) |
| Foreign | | | 95,041 | | | | (172,571 | ) |
| Total deferred | | | 31,711 | | | | (209,121 | ) |
| | | | | | | | | |
| Total income tax provision | | $ | 314,713 | | | $ | 37,790 | |
|
| Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
| | | Year Ended June 30, 2026 | |
| | | Amount | | | Percent | |
| | | | | | | | | |
| Current tax at U.S. statutory rate | | $ | (4,248,479 | ) | | | 21.0 | % |
| State income taxes, net of federal benefit (1) | | | (13,657 | ) | | | 0.1 | % |
| Foreign tax effects | | | | | | | | |
| Latvia - statutory rate differences | | | (598,961 | ) | | | 3.0 | % |
| Other foreign tax effects | | | 11,865 | | | | (0.1 | )% |
| Effect of cross-border tax law | | | | | | | | |
| GILTI | | | 848,864 | | | | (4.2 | )% |
| Tax credits | | | | | | | | |
| Federal research and development credit expiration | | | 103,598 | | | | (0.5 | )% |
| Changes in valuation allowance | | | 3,256,056 | | | | (16.1 | )% |
| Nondeductible/nontaxable items | | | 173,242 | | | | (0.9 | )% |
| NOL expiration and adjustments | | | 733,630 | | | | (3.6 | )% |
| Other adjustments | | | 48,555 | | | | (0.2 | )% |
| | | $ | 314,713 | | | | (1.6 | )% |
| | | Year Ended June 30, 2025 | |
| | | | | |
| U.S. federal statutory tax rate | | | 21 | % |
| | | | | |
| Income tax provision reconciliation: | | | | |
| Tax at statutory rate: | | $ | (3,115,433 | ) |
| Net foreign income subject to lower tax rate | | | (60,104 | ) |
| State income taxes, net of federal benefit | | | (475,224 | ) |
| Valuation allowance | | | 1,879,595 | |
| NOL expiration and adjustments | | | 939,505 | |
| GILTI | | | 192,980 | |
| Federal research and development credit expiration | | | 206,467 | |
| Federal research and development and other credits | | | (225,532 | ) |
| Rate change | | | 14,759 | |
| Stock-based compensation | | | (66,682 | ) |
| Other permanent differences | | | 54,147 | |
| Acquisition financing | | | 455,901 | |
| Prior year true-ups | | | 237,411 | |
| | | $ | 37,790 | |
|
| Schedule of Income Taxes Paid [Table Text Block] |
| | | Year Ended June 30, 2026 | |
| | | | | |
| Federal tax | | $ | — | |
| | | | | |
| State: | | | | |
| New Hampshire | | | 11,488 | |
| Other states | | | 8,376 | |
| Total state | | | 19,864 | |
| | | | | |
| Foreign: | | | — | |
| China income tax | | | 237,990 | |
| China withholding tax | | | 67,782 | |
| Total foreign | | | 305,772 | |
| | | | | |
| Total cash paid for income taxes (net of refunds) | | $ | 325,636 | |
|
| Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
| | | Year Ended June 30, | |
| | | 2026 | | | 2025 | |
| Deferred tax assets: | | | | | | | | |
| Net operating loss carryforwards | | $ | 10,494,407 | | | $ | 10,086,362 | |
| Stock-based compensation | | | 342,093 | | | | 315,311 | |
| R&D and other credits | | | 1,849,781 | | | | 1,954,068 | |
| Capitalized R&D expenses | | | 781,803 | | | | 1,203,265 | |
| Inventories | | | 392,489 | | | | 331,725 | |
| Intangible assets | | | 1,513,177 | | | | — | |
| Lease liability | | | 2,244,816 | | | | 2,149,965 | |
| Disallowed interest expense | | | 180,651 | | | | 200,821 | |
| Accrued expenses and other | | | 2,550,285 | | | | 540,585 | |
| Gross deferred tax assets | | | 20,349,502 | | | | 16,782,102 | |
| Valuation allowance for deferred tax assets | | | (17,789,144 | ) | | | (13,963,557 | ) |
| Total deferred tax assets | | | 2,560,358 | | | | 2,818,545 | |
| Deferred tax liabilities: | | | | | | | | |
| Depreciation and other | | | (218,395 | ) | | | (321,825 | ) |
| Right-of-use asset | | | (2,351,145 | ) | | | (2,212,710 | ) |
| Intangible assets | | | — | | | | (414,199 | ) |
| Total deferred tax liabilities | | | (2,569,540 | ) | | | (2,948,734 | ) |
| Net deferred tax assets (liabilities) | | $ | (9,182 | ) | | $ | (130,189 | ) |
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