Note 10 - Stock-Based Compensation (Details) - Stock-Based Compensation Expense (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-Based Compensation Expense [Abstract]
Total cost of stock-based compensation	$ 141,570	$ 128,567	$ 284,177	$ 260,675
Amount of income tax benefit recognized in earnings	(21,790)	(21,799)	(42,964)	(43,803)
Amount charged against net income	$ 119,780	$ 106,768	$ 241,213	$ 216,872