Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Investor Relations Consultant [Member]
Price of shares issued (in dollars per share)		$ 1.18
Consultant Contract One [Member] | Common Stock [Member]
Price of shares issued (in dollars per share)	$ 1.18
Consultant Contract Two [Member] | Common Stock [Member]
Price of shares issued (in dollars per share)	1.18
Contract with TumorGenesis [Member] | Common Stock [Member]
Price of shares issued (in dollars per share)	1.17
Series E Warrants [Member] | Common Stock [Member]
Warrant exercises, exercise price per share (in dollars per share)	1
Common Stock [Member] | Over-Allotment Option [Member]
Price of shares issued (in dollars per share)	$ 0.9497