Computation of Diluted Earning Per Share with Exclusion of Antidilutive Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net earnings (loss)	$ 307	$ 612	$ (534)	$ 553
Denominator:
Weighted average shares outstanding	4,607	4,548	4,590	4,530
Dilutive effect of stock options and non-vested restricted shares	57	78		91
Denominator for diluted net earnings (loss) per share	4,664	4,626	4,590	4,621