Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2022	Dec. 31, 2021
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	2,000,000	2,000,000
Preferred stock, shares outstanding (in shares)	1,645,000	1,645,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	14,772,261	9,450,921
Common stock, shares outstanding (in shares)	14,485,274	9,163,934
Preferred stock held in treasury, shares (in shares)	355,000	355,000
Common stock held in treasury, shares (in shares)	286,987	286,987