Note N - Other Income and Expense - Other Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign exchange transaction gain (loss)	$ 20	$ 663	$ (2,012)
Government subsidy income	1,614	934	211
Other non-operating gain	219	224	110
Loss on disposal of assets	(13)	(7)	(97)
Total other income (expense), net	$ 1,840	$ 1,814	$ (1,788)