Note 2 - Significant Accounting Policies (Detail) - Basic earnings per share are computed based on the weighted average number of common shares outstanding during the period: (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income (in Dollars)	$ 5,596,070	$ 4,752,601	$ 4,160,257
Weighted average common shares outstanding	10,157,395	10,156,442	10,208,944
Earnings per share – basic (in Dollars per share)	$ 0.55	$ 0.47	$ 0.41
DILUTED
Effect of assumed exercise of stock options and warrants	17,951	25,656	42,919
Weighted average common shares outstanding, assuming dilution	10,175,346	10,182,098	10,251,863
Earnings per share - diluted (in Dollars per share)	$ 0.55	$ 0.47	$ 0.41
Outstanding options and warrants excluded as anti-dilutive		25,000	13,000