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Quarterly Results of Operations (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
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, 2010
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Information [Line Items]                              
Revenues $ 28,031 $ 28,308 $ 28,728 $ 27,141 $ 23,866 $ 23,921 $ 25,414 $ 22,019 $ 21,451 $ 20,791 $ 21,580 $ 19,669 $ 112,208 $ 95,220 $ 83,491
Income (loss) from continuing operations 1,658 2,372 2,801 2,714 1,521 1,898 2,257 2,286 2,089 2,530 3,285 2,348 9,545 7,962 10,252
Net income (loss) $ 1,604 $ 2,195 $ 2,745 $ 2,647 $ 1,453 $ 1,823 $ 2,117 $ 2,185 $ 1,959 $ 888 $ 2,923 $ 2,076 $ 9,191 $ 7,578 $ 7,846
Basic income (loss) per share:                              
Income (loss) from continuing operations (in dollars per share) $ 0.17 $ 0.24 $ 0.29 $ 0.28 $ 0.15 $ 0.19 $ 0.23 $ 0.23 $ 0.21 $ 0.25 $ 0.33 $ 0.23 $ 0.98 $ 0.80 $ 1.01
Net income (loss) (in dollars per share) $ 0.17 $ 0.23 $ 0.29 $ 0.28 $ 0.15 $ 0.19 $ 0.22 $ 0.23 $ 0.20 $ 0.09 $ 0.29 $ 0.21 $ 0.97 $ 0.78 $ 0.79
Diluted income (loss) per share:                              
Income (loss) from continuing operations (in dollars per share) $ 0.17 $ 0.24 $ 0.29 $ 0.28 $ 0.15 $ 0.19 $ 0.23 $ 0.23 $ 0.21 $ 0.25 $ 0.32 $ 0.23 $ 0.98 $ 0.80 $ 1.01
Net income (loss) (in dollars per share) $ 0.17 $ 0.23 $ 0.29 $ 0.28 $ 0.15 $ 0.19 $ 0.22 $ 0.23 $ 0.20 $ 0.09 $ 0.29 $ 0.21 $ 0.96 $ 0.78 $ 0.79
Basic weighted average shares outstanding (in shares) 9,504 9,479 9,514 9,575 9,633 9,725 9,720 9,685 9,815 9,924 9,937 10,043 9,518 9,691 9,930
Diluted weighted average shares outstanding (in shares) 9,603 9,647 9,988 9,833 9,636 9,731 9,731 9,687 9,817 9,941 10,771 10,045 9,615 9,697 9,932