Note 5 - Investment Securities - Available For Sale (Details) - Short-term Investment by Bond Maturities (USD $)	Sep. 30, 2013	Dec. 31, 2012
Within 3 Months [Member]
Corporate bond maturities
Cost	$ 19,170,591	$ 3,053,740
Fair value	19,015,521	3,002,350
Between 3-12 Months [Member]
Corporate bond maturities
Cost	13,173,878	5,110,487
Fair value	13,023,117	5,035,270
Bond maturities [Member]
Corporate bond maturities
Cost	32,344,469	8,164,227
Fair value	$ 32,038,638	$ 8,037,620