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Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Expected provision at federal statutory tax rate at 21% | $ (46) | $ 1,003
Decrease in valuation allowance | (33) | (346)
State and local taxes | 84 | 6
Foreign tax rate differential | 4 | (116)
US taxation of foreign operations | 80 | 0
Federal research and development credits | (55) | (57)
Change in tax rates | 10 | 0
Non-deductible expenses | 62 | 51
Other | (102) | 0
Income tax expense | 4 | 28
Paycheck Protection Program CARES Act [Member] |  |
PPP loan forgiveness | $ 0 | $ (513)

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