Computation of Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic and diluted earning/loss per share [Abstract]
Net income/(loss)	$ (340,600)	$ 1,112,900	$ 4,613,300	$ 3,398,500
Weighted average shares outstanding for the period (in shares)	1,543,257	1,543,257	1,543,257	1,543,257
Dilutive effect of warrants (in shares)	0	21,800	44,072	17,196
Weighted average diluted shares used in calculation of diluted earnings/(loss) per share (in shares)	1,543,257	1,565,057	1,587,329	1,560,453
Basic earnings/(loss) per share (in dollars per share)	$ (0.22)	$ 0.72	$ 2.99	$ 2.20
Diluted earnings/(loss) per share (in dollars per share)	$ (0.22)	$ 0.71	$ 2.91	$ 2.18
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially outstanding shares was not included in the calculation of diluted loss per share (in shares)	46,907