Note 5 - Fair Value of Marketable Securities (Details) - USD ($)	Jun. 30, 2015
Fair Market Value	$ 87,991,589
Marketable securities, debt maturities due within one year, fair value	17,559,217
Marketable securities, debt maturities due after one year through three years, fair value	47,260,141
Marketable securities, debt maturities due after three years through five years, fair value	$ 23,172,231