Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2023	Dec. 31, 2022
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)	2,865,897	2,870,332
Common stock, shares outstanding (in shares)	2,865,897	2,870,332