Note 11 - Stockholders' Equity (Detail) (USD $)	0 Months Ended	1 Months Ended				12 Months Ended
	Jul. 05, 2010	Apr. 28, 2012	Feb. 28, 2012	Feb. 28, 2012	May 30, 2010	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2009	Feb. 27, 2009	Dec. 04, 2009 Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						6 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term						10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						33,400
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									1,000,000
Share Price (in Dollars per share)									$ 2.85	$ 3.70
Stock Repurchased During Period, Shares							2,300	60,927
Stock Repurchase Program, Authorized Amount (in Dollars)							$ 207,683
Common Stock, Dividends, Per Share, Declared (in Dollars per share)				$ 0.25	$ 0.75
Payments of Dividends (in Dollars)	$ 7,700,000	$ 2,500,000	$ 2,500,000			$ 2,536,131	$ 7,690,832