Computation of Diluted Earning Per Share with Exclusion of Antidilutive Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Net earnings (loss)	$ (1,480)	$ 307	$ 504	$ (1,345)	$ (1,439)	$ 612	$ 980	$ (1,039)	$ (2,014)	$ (886)	$ 152
Denominator:
Weighted average shares outstanding									4,597	4,535	4,475
Dilutive effect of stock options and restricted shares											99
Denominator for diluted earnings (loss) per share									4,597	4,535	4,574