Note O - Income Taxes - Reconciliation of the U.S. Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expected taxes at statutory rate	$ (13,943)	$ (11,374)	$ (10,775)
PPP loan forgiveness	0	(1,308)	0
Non-deductible/non-taxable items	33	897	1,132
Foreign rate differences	552	107	1,153
Foreign permanent differences	(1,407)	(1,320)	(1,002)
Changes in valuation allowance	14,196	13,822	17,137
Share-based compensation	879	468	426
Research and development credits	(626)	(872)	(744)
Alternative Minimum Tax	0	0	(172)
Foreign other	0	0	12
Other, net	317	(418)	61
Income tax (benefit) expense	$ 1	$ 2	$ 7,228