Note Q - Supplemental Information (Details) - Allowance for Doubtful Accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Abstract]
Balance at beginning of period	$ 1,448	$ 1,746	$ 1,922
Bad debt expense	112	336	(64)
Net recoveries (write-offs)	193	(634)	(112)
Balance at end of period	$ 1,753	$ 1,448	$ 1,746