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Distributions (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 30, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of payment of distributions to shareholders                              
Distributions including dividends reinvested paid to common shareholders $ 3,656,622 $ 3,456,304 $ 3,294,938 $ 3,155,607 $ 3,062,506 $ 2,954,616 $ 2,902,806 $ 2,809,868 $ 2,723,255 $ 2,652,386 $ 2,595,832 $ 2,523,564 $ 13,563,471 $ 11,729,796 $ 10,495,037
Dividend declared per share, paid $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.72 $ 0.72 $ 0.72