Note 7 - Acquisition of EGEN Assets - Summary of Estimated Fair Values of Acquired Assets and Liabilities (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Jun. 20, 2014
Goodwill	$ 1,976,101	$ 1,976,101
EGEN Inc [Member]
Property and equipment, net			$ 35,000
In-process research and development			24,211,000
Other intangible assets (Covenant not to compete)			1,591,000
Goodwill			1,976,000
Total assets			27,813,000
Accounts payable and accrued liabilities			(235,000)
Net assets acquired			$ 27,578,000