Note 3 - Acquisition of SynGen Inc.- Supplemental Pro Forma Data (Details) - SynGen [Member] - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Net revenues	$ 6,013,000	$ 15,592,000
Net loss	$ (2,600,000)	$ (30,701,000)
Basic and diluted net loss per common share (in dollars per share)	$ (0.21)	$ (3.39)