Note R - Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	2013								2012
	1Q		2Q		3Q		4Q		1Q		2Q		3Q		4Q
Contract revenue	$	233,921	$	241,568	$	244,055	$	229,759	$	227,641	$	239,649	$	237,864	$	231,979
Operating income		17,649		17,295		17,154		12,587		16,374		18,268		16,995		14,545
Net income	$	10,112	$	10,331	$	11,131	$	7,756	$	8,937	$	10,346	$	9,573	$	9,219
Earnings per share:
Basic	$	0.52	$	0.52	$	0.56	$	0.39	$	0.45	$	0.52	$	0.49	$	0.47
Diluted		0.51		0.52		0.55		0.38		0.45		0.52		0.48		0.47
Weighted-average common shares outstanding
Basic		19,543		19,706		19,802		19,826		19,769		19,774		19,610		19,501
Diluted		19,875		19,996		20,165		20,233		20,082		19,971		19,770		19,690