Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, liquidation value	0.001	0.001
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares designated	825,000	825,000
Preferred stock, shares issued	10,000	10,000
Preferred stock, shares outstanding	10,000	10,000
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	19,407,057	10,528,689
Common stock, shares, outstanding	19,407,057	10,528,689
Treasury stock (shares)	11,080	11,080