Earnings Per Share (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Basic weighted average shares outstanding	4,870,114	4,866,933
Dilutive effect of granted options	450	5,429
Diluted weighted average shares outstanding	4,870,564	4,872,362
Net income	$ 1,797,153	$ 1,414,446
Net income per share-basic	$ 0.37	$ 0.29
Net income per share-diluted	$ 0.37	$ 0.29