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Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations attributable to PPP loan forgiveness.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to US taxation of foreign operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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