Note 13 - Subsequent Events (Details Textual) - $ / shares	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2017
Private Placement [Member]
Stock Issued During Period, Shares, New Issues		770,000
Subsequent Event [Member] | Dr. Stephen Chen, Bernard Cohen, and Lawrence Lin [Member]
Stock Issued During Period, Shares, Share-based Compensation, Gross	136,000
Subsequent Event [Member] | Private Placement [Member]
Stock Issued During Period, Shares, New Issues	200,000
Shares Issued, Price Per Share	$ 0.25