Note 5 - Investment Securities - Available For Sale (Details) - Short-Term Investment by Bond Maturities (USD $)	Mar. 31, 2014	Dec. 31, 2013
Within 3 Months [Member]
Corporate bond maturities
Cost	$ 11,798,892	$ 7,799,033
Fair value	11,750,665	7,797,689
Between 3-12 Months [Member]
Corporate bond maturities
Cost	35,484,492	29,401,514
Fair value	35,504,822	29,358,692
Summary of Short Term Investment [Member]
Corporate bond maturities
Cost	47,283,384	37,200,547
Fair value	$ 47,255,487	$ 37,156,381