Share Repurchase Program (Detail) - Share Repurchase Programs (USD $)	1 Months Ended		13 Months Ended	14 Months Ended	1 Months Ended	3 Months Ended
	May 31, 2012	Aug. 31, 2011	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011 August 25 2011 Through September 30 2011 [Member]	Dec. 31, 2011 October 1 2011 Through December 31 2011 [Member]	Mar. 31, 2012 January 1 2012 Through March 31 2012 [Member]	Jun. 30, 2012 April 1 2012 Through June 30 2012 [Member]	Sep. 30, 2012 July 1 2012 through September 30 2012 [Member]
Stock repurchase program, authorized amount	$ 6,000,000	$ 6,000,000
Stock repurchase program, commission on repurchase of shares			76,000
Total Number of Shares Purchased			2,306,590	2,306,590	571,554	130,160	334,636	1,124,797	145,443
Average Price Paid Per Share (in Dollars per share)			$ 5.20		$ 5.89	$ 5.71	$ 5.64	$ 4.70	$ 4.88
Total Cost			12,000,000		3,367,000	744,000	1,889,000	5,290,000	710,000
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program					$ 2,633,000	$ 1,889,000		$ 710,000