Consolidated Statement of Stockholders' Equity (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common Stock [Member] | Issuance 1 [Member]
Shares issued, offering cost per share (in dollars per share)	$ 4.63	$ 4.04
Common Stock [Member] | Convertible Preferred Stock [Member]
Convertible Preferred shares, convertible securities (in shares)		4
Common Stock [Member]
Shares issued, offering cost per share (in dollars per share)	$ 7.25	$ 1.36
Additional Paid-in Capital [Member]
Shares issued, offering cost	$ 1,548,161	$ 747,423