Note 7 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
U.S. Federal tax benefit at statutory rates, amount	$ (811)	$ (471)
U.S. Federal tax benefit at statutory rates, percent	21.00%	21.00%
State income tax, amount	$ (71)	$ (83)
State income tax, percent	(1.80%)	(3.70%)
International operations, amount	$ 218	$ 28
International operations, percent	(5.70%)	(1.30%)
Stock-based compensation, amount	$ 32	$ 93
Stock-based compensation, percent	(0.80%)	(4.20%)
Valuation allowance, amount	$ (2,383)	$ 429
Valuation allowance, percent	61.70%	(19.10%)
Expiration of tax attributes, amount	$ 3,000	$ 311
Expiration of tax attributes, percent	(77.70%)	(13.90%)
PPP loan forgiveness, amount	$ 0	$ (333)
PPP loan forgiveness, percent	0.00%	14.90%
Other, net, amount	$ 15	$ 26
Other, net, percent	(0.40%)	(1.10%)
Tax expense and effective tax rate, amount	$ (0)	$ (0)
Tax expense and effective tax rate, percent	0.00%	0.00%