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Quarterly Results of Operations (Details) (USD $)
In Thousands, except Share data, 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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Revenues $ 22,019 $ 23,866 $ 23,921 $ 25,414 $ 19,669 $ 21,451 $ 20,791 $ 21,580 $ 16,841 $ 19,131 $ 18,022 $ 20,069 $ 95,220 $ 83,491 $ 74,063
Income (loss) from continuing operations 2,286 1,521 1,898 2,257 2,348 2,089 2,530 3,285 1,194 (1,370) 1,123 2,958 7,962 10,252 3,905
Net income (loss) $ 2,185 $ 1,453 $ 1,823 $ 2,117 $ 2,076 $ 1,959 $ 888 $ 2,923 $ 783 $ (12,543) $ 857 $ 2,945 $ 7,578 $ 7,846 $ (7,958)
Basic income per share:                              
Income from continuing operations (in dollars per share) $ 0.23 $ 0.16 $ 0.19 $ 0.23 $ 0.23 $ 0.21 $ 0.25 $ 0.33 $ 0.12 $ (0.14) $ 0.11 $ 0.31 $ 0.80 $ 1.01 $ 0.38
Net income (loss) $ 0.23 $ 0.15 $ 0.19 $ 0.22 $ 0.21 $ 0.20 $ 0.09 $ 0.29 $ 0.08 $ (1.24) $ 0.09 $ 0.31 $ 0.78 $ 0.79 $ (0.82)
Diluted earnings per share:                              
Income from continuing operations (in dollars per share) $ 0.23 $ 0.15 $ 0.19 $ 0.23 $ 0.23 $ 0.21 $ 0.25 $ 0.32 $ 0.12 $ (0.14) $ 0.11 $ 0.31 $ 0.80 $ 1.01 $ 0.38
Net income (loss) (in dollars per share) $ 0.23 $ 0.15 $ 0.19 $ 0.22 $ 0.21 $ 0.20 $ 0.09 $ 0.29 $ 0.08 $ (1.24) $ 0.09 $ 0.31 $ 0.78 $ 0.79 $ (0.82)
Basic weighted average shares outstanding (in shares) 9,685 9,633 9,725 9,720 10,043 9,815 9,924 9,937 9,370 10,153 9,905 9,314 9,691 9,930 9,697
Diluted weighted average shares outstanding (in shares) 9,687 9,636 9,731 9,731 10,045 9,817 9,941 10,771 9,385 10,153 9,958 9,488 9,697 9,932 9,697