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Other - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
Aug. 15, 2013
May 15, 2013
Apr. 30, 2013
Feb. 15, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Oct. 31, 2013
Subsequent Event
Other [Line Items]                  
Cash dividend paid $ 397,000 $ 401,000   $ 319,000     $ 1,117,000 $ 935,000  
Dividend payable         398,000   398,000    
Cash dividend payable         $ 0.03125 $ 0.02500 $ 0.09375 $ 0.10000 $ 0.0375
Dividend declared date                 Oct. 31, 2013
Dividend payable date                 Feb. 14, 2014
Dividend recorded date                 Jan. 31, 2014
Stock repurchase program authorized     $ 10,000,000       $ 3,200,000    
Stock repurchase program authorized shares         245,575   245,575