Note P - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Balance at beginning of period	$ 1,887	$ 1,753	$ 1,448
Bad debt expense	268	272	112
Net recoveries (write-offs)	(8)	$ (138)
Net recoveries (write-offs)			$ 193
Effect of foreign currency translation	(9)
Balance at end of period	$ 2,138	$ 1,887	$ 1,753