Note 10 - Income Taxes (Tables)
|
12 Months Ended |
Dec. 31, 2025 |
| Notes Tables |
|
| Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
| | | Year Ended December 31, | |
| (In thousands) | | 2025 | | | 2024 | |
| Domestic | | $ | (27,216 | ) | | $ | (30,036 | ) |
| Foreign | | | 47 | | | | (1,052 | ) |
| Loss before income taxes | | $ | (27,169 | ) | | $ | (31,088 | ) |
|
| Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
| | | Year Ended December 31 | |
| (In thousands) | | 2025 | | | 2024 | |
| Current: | | | | | | | | |
| Federal | | $ | — | | | $ | (1,260 | ) |
| State | | | 13 | | | | (278 | ) |
| Foreign | | | (156 | ) | | | 3 | |
| Total current | | | (143 | ) | | | (1,535 | ) |
| Deferred: | | | | | | | | |
| Federal | | | (6,415 | ) | | | (7,597 | ) |
| State | | | (1,576 | ) | | | (1,001 | ) |
| Foreign | | | 141 | | | | (275 | ) |
| Less: valuation allowance | | | 7,991 | | | | 8,597 | |
| Total deferred | | | 141 | | | | (276 | ) |
| Total income tax benefit | | $ | (2 | ) | | $ | (1,811 | ) |
|
| Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
| | | Year Ended December 31, | |
| (In thousands) | | 2025 | |
| Federal income taxes at the statutory rate | | $ | (5,705 | ) | | | 21.0 | % |
| State and local income tax, net of federal income tax effect (1) | | | | | | | | |
| State changes in valuation allowance | | | 1,576 | | | | (5.8 | ) |
| Other | | | (1,565 | ) | | | 5.8 | |
| Foreign tax effects | | | | | | | | |
| Canada | | | (26 | ) | | | 0.1 | |
| Effect of changes in tax laws or rates enacted in the current period | | | — | | | | — | |
| Effect of cross-border tax laws | | | 9 | | | | (0.0 | ) |
| Tax credits | | | | | | | | |
| Research and development credit | | | (1,015 | ) | | | 3.7 | |
| Changes in valuation allowance | | | | | | | | |
| U.S. federal changes | | | 6,415 | | | | (23.6 | ) |
| Non-taxable or non-deductible items | | | | | | | | |
| Other | | | 45 | | | | (0.2 | ) |
| Changes in unrecognized tax benefits | | | — | | | | — | |
| Other reconciling items | | | 264 | | | | (1.0 | ) |
| Income tax benefit | | $ | (2 | ) | | | 0.0 | % |
| | | Year Ended December 31, |
| (In thousands) | | 2024 |
| Federal income taxes at the statutory rate | | $ (6,528) | | 21.0% |
| Share-based compensation shortfall (windfall) | | 6 | | (0.0) |
| Effect of state taxes, net of federal tax benefit | | (999) | | 3.2 |
| Non-deductible items | | 39 | | (0.1) |
| Return to provision adjustment | | (540) | | 1.7 |
| Foreign rate difference | | (56) | | 0.2 |
| Deferred only adjustments | | 343 | | (1.1) |
| Changes in valuation allowance | | 8,597 | | (27.7) |
| Research and development tax credit | | (1,194) | | 3.8 |
| Reversal of uncertain tax positions | | (1,480) | | 4.8 |
| Other | | 1 | | (0.0) |
| Income tax benefit | | $ (1,811) | | 5.8% |
|
| Schedule of Income Taxes Paid [Table Text Block] |
| | | Year Ended December 31 | |
| (In thousands) | | 2025 | |
| Federal | | $ | — | |
| State and local | | | (69 | ) |
| Foreign | | | — | |
| Total taxes paid, net of refunds (1) | | $ | (69 | ) |
|
| Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
| (In thousands) | | December 31, 2025 | | | December 31, 2024 | |
| Deferred tax assets: | | | | | | | | |
| Net operating loss carryforwards | | $ | 10,894 | | | $ | 5,136 | |
| Share-based compensation | | | 4,590 | | | | 4,569 | |
| Capitalized research and experimental expenditures | | | 6,324 | | | | 5,257 | |
| Intangible assets, net | | | 1,954 | | | | 2,230 | |
| Tax credits | | | 3,801 | | | | 2,786 | |
| Accrued expense | | | 678 | | | | 894 | |
| Operating lease liability | | | 769 | | | | 450 | |
| Interest expense limitation | | | 2,439 | | | | 1,652 | |
| Accounts receivable, net | | | 40 | | | | 119 | |
| Other | | | 485 | | | | 765 | |
| | | | 31,974 | | | | 23,858 | |
| Valuation allowance | | | (31,156 | ) | | | (23,165 | ) |
| Total deferred tax assets, net of valuation allowance | | | 818 | | | | 693 | |
| | | | | | | | | |
| Deferred tax liabilities: | | | | | | | | |
| Operating lease right-of-use asset | | | (711 | ) | | | (383 | ) |
| Property and equipment, net | | | (1 | ) | | | (64 | ) |
| | | | (712 | ) | | | (447 | ) |
| Net deferred tax asset (liability) | | $ | 106 | | | $ | 246 | |
|
| Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
| | | Year Ended December 31, | |
| (In thousands) | | 2025 | | | 2024 | |
| Unrecognized tax benefits, opening balance | | $ | — | | | $ | 1,480 | |
| Settlement/expiration of statutes of limitations | | | — | | | | (1,480 | ) |
| Unrecognized tax benefits, ending balance | | $ | — | | | $ | — | |
|