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Earnings Per Share (Schedule of Computation of Numerator and Denominator in Earnings Per Share) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator:                      
Net income (loss) attributable to common shareholders $ 668,913us-gaap_NetIncomeLoss $ 745,920us-gaap_NetIncomeLoss $ 722,570us-gaap_NetIncomeLoss $ 286,320us-gaap_NetIncomeLoss $ (1,500,363)us-gaap_NetIncomeLoss $ (819,942)us-gaap_NetIncomeLoss $ (639,018)us-gaap_NetIncomeLoss $ 854,709us-gaap_NetIncomeLoss $ 2,423,723us-gaap_NetIncomeLoss $ (2,104,614)us-gaap_NetIncomeLoss $ 5,842,492us-gaap_NetIncomeLoss
Denominator:                      
Weighted-average shares outstanding – basic (in shares)                 17,617,765us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,332,997us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 19,564,625us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of restricted stock and stock options (in shares)                 281,867us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 222,912us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted-average shares outstanding – diluted (in shares)                 17,899,632us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,332,997us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 19,787,537us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding