Note J - Business Segment and Geographic Disclosures (Detail) - Operations by Geographic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Revenues	$ 24,907	$ 24,023	$ 71,030	$ 65,666
Assets	104,522		104,522		112,990
United States [Member]
Revenues	16,609	19,121	57,519	54,268
Assets	85,338		85,338		99,601
Foreign [Member]
Revenues	8,298	4,902	13,511	11,398
Assets	$ 19,184		$ 19,184		$ 13,389