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Note 11 - Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]    
Accrued expenses $ 122 $ 128
Depreciation 82 245
Lease liability 25 55
Net operating loss carryforwards 27,383 24,703
Stock compensation 1,216 1,470
Capitalized research and development costs 3,771 2,515
Total deferred tax assets 32,599 29,116
Operating right-of-use asset 23 52
Prepaid expense 108 112
Total deferred tax liabilities 131 164
Net deferred tax asset 32,468 28,952
Valuation allowance (32,468) (28,952)
Net deferred taxes $ 0 $ 0