Note 4 - Investments (Details) - Proceeds from Sales and Maturities of Investments in Available-for-sale (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Proceeds from Sales and Maturities of Investments in Available-for-sale [Abstract]
Proceeds from sales and maturities	$ 47,541,392	$ 6,723,467	$ 76,205,748	$ 25,843,682
Gross realized gains	2,436,585	251,815	2,544,968	455,444
Gross realized losses	$ (17,779)	$ (1,888)	$ (48,905)	$ (7,258)