Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Common stock, par value (in dollars per share)	$ 0.02	$ 0.02
Common stock, shares authorized (in shares)	35,000,000	35,000,000
Common stock, shares issued (in shares)	2,873,031	2,873,031
Common stock, shares outstanding (in shares)	2,873,031	2,873,031