Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
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)	9,449,083	5,350,000
Common stock, shares outstanding (in shares)	9,162,096	5,022,578
Preferred stock held in treasury, shares (in shares)	355,000	355,000
Common stock held in treasury, shares (in shares)	286,987	327,422