Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares $ / shares in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Common stock, par value (in dollars per share)	$ 0	$ 0	$ 0
Common stock, shares authorized (in shares)	25,000,000	25,000,000	25,000,000
Common stock, shares issued (in shares)	7,354,060	7,339,011	7,313,075
Common stock, shares outstanding (in shares)	7,354,060	7,339,011	7,313,075