Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	930,000	930,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	13,911,633	9,156,260
Common stock, shares outstanding (in shares)	13,911,633	9,156,260
Series A Convertible Preferred Stock [Member]
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized (in shares)	45,000	45,000
Convertible preferred stock, shares issued (in shares)	15,000	15,000
Convertible preferred stock, shares outstanding (in shares)	15,000	15,000
Convertible preferred stock, liquidation value	$ 17,385,970	$ 17,385,970
Series B Convertible Preferred Stock [Member]
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized (in shares)	25,000	25,000
Convertible preferred stock, shares issued (in shares)	8,000	0
Convertible preferred stock, shares outstanding (in shares)	8,000	0
Convertible preferred stock, liquidation value	$ 8,409,825	$ 8,409,825