Note 4 - Earnings Per Share (Detail) - The following table sets forth the computation of basic and diluted earnings per share: (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (in Dollars)	$ 1,586,321	$ 1,574,105
Numerator for basic and diluted earnings per share (in Dollars)	$ 1,586,321	$ 1,574,105
Denominator for basic earnings per share – weighted-average shares	10,162,442	10,156,442
Effect of dilutive securities:
Effect of dilutive securities	31,777	16,508
Denominator for diluted earnings per share – weighted-average shares	10,194,219	10,172,950
Basic earnings per share (in Dollars per share)	$ 0.16	$ 0.15
Diluted earnings per share (in Dollars per share)	$ 0.16	$ 0.15
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	31,777	16,508