Note J - Income Taxes (Details) - Effective Income Tax Rate Reconciliation	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate Reconciliation [Abstract]
Taxes at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	4.20%	4.60%	4.60%
Foreign tax rate differential and U.S. unrepatriated earnings	(0.30%)	(0.30%)	0.00%
Other permanent differences	0.70%	0.80%	0.60%
Prior year tax adjustments and changes in unrecognized tax benefits	(2.10%)	(0.90%)	(1.20%)
Tax credits	(0.70%)	(0.70%)	(0.40%)
	36.80%	38.50%	38.60%