Note 6 - Investment Securities Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Corporate Debt Securities [Member]
Available for Sale (all unrealized holding gains and losses are less than 12 months at date of measurement)
Short-term investments with unrealized gains	$ 2,160,000	$ 240,024
Short-term investments with unrealized gains		24
Short-term investments with unrealized losses		10,559,866
Short-term investments with unrealized losses		(3,882)
Short-term Investments	$ 2,160,000	10,799,890
Total		$ (3,858)